Regex Replace and Search Plugin for Obsidian written in Vanilla.js

I made an upgrade on this to have the modal become a sidebar element which you can open in Hover editor, and fixed the before and after states and now you can click on before matches so you are taken to the lines in the file.

const { Plugin, WorkspaceLeaf, ItemView, Setting, Notice, Modal, Menu } = require("obsidian");

const VIEW_TYPE_REGEX_REPLACE = "regex-replace-view";
const MAX_MATCHES_TO_DISPLAY = 100;
const MAX_TEXT_LENGTH_FOR_AUTO_PREVIEW = 50000; // 50k characters
const DEBOUNCE_DELAY = 500; // ms

module.exports = class RegexReplaceSidebarPlugin extends Plugin {
	async onload() {
		this.settings = Object.assign(
			{ 
				pattern: "", replacement: "", flags: "gm", 
				onlySelection: false, replaceAll: true,
				presets: [],
				autoPreview: true
			}, 
			await this.loadData()
		);

		this.registerView(
			VIEW_TYPE_REGEX_REPLACE,
			(leaf) => new RegexReplaceView(leaf, this)
		);

		this.addRibbonIcon("replace", "Regex Replace", () => {
			this.activateView();
		});

		this.addCommand({
			id: "open-regex-replace-sidebar",
			name: "Open Regex Replace Sidebar",
			callback: () => this.activateView(),
		});

		this.addCommand({
			id: "regex-search-replace",
			name: "Regex Search & Replace (Quick)",
			editorCallback: (editor) => {
				const view = this.getRegexReplaceView();
				if (view) {
					view.executeReplace(editor);
				}
			},
		});

		this.registerEvent(
			this.app.workspace.on("editor-menu", (menu, editor) =>
				menu.addItem((item) =>
					item.setTitle("Regex Search & Replace").setIcon("search").onClick(() => {
						this.activateView();
						const view = this.getRegexReplaceView();
						if (view) {
							view.setCurrentEditor(editor);
						}
					})
				)
			)
		);
	}

	onunload() {
		this.app.workspace.detachLeavesOfType(VIEW_TYPE_REGEX_REPLACE);
	}

	async activateView() {
		const { workspace } = this.app;

		let leaf = null;
		const leaves = workspace.getLeavesOfType(VIEW_TYPE_REGEX_REPLACE);

		if (leaves.length > 0) {
			leaf = leaves[0];
		} else {
			leaf = workspace.getRightLeaf(false);
			await leaf.setViewState({ type: VIEW_TYPE_REGEX_REPLACE, active: true });
		}

		workspace.revealLeaf(leaf);
	}

	getRegexReplaceView() {
		const leaves = this.app.workspace.getLeavesOfType(VIEW_TYPE_REGEX_REPLACE);
		return leaves.length > 0 ? leaves[0].view : null;
	}
};

class RegexReplaceView extends ItemView {
	constructor(leaf, plugin) {
		super(leaf);
		this.plugin = plugin;
		this.currentEditor = null;
		this.controls = {};
		this.previewTimeout = null;
		this.approvedLargeFiles = new Set(); // Track which files user has approved
		
		this.pattern = plugin.settings.pattern;
		this.replacement = plugin.settings.replacement;
		this.flags = plugin.settings.flags;
		this.onlySelection = plugin.settings.onlySelection;
		this.replaceAll = plugin.settings.replaceAll;
		this.autoPreview = plugin.settings.autoPreview;
	}

	getViewType() {
		return VIEW_TYPE_REGEX_REPLACE;
	}

	getDisplayText() {
		return "Regex Replace";
	}

	getIcon() {
		return "arrow-left-right";
	}

	setCurrentEditor(editor) {
		this.currentEditor = editor;
		this.updatePreview();
	}

	getCurrentEditor() {
		const markdownLeaves = this.app.workspace.getLeavesOfType("markdown");
		
		let mostRecentEditor = null;
		let mostRecentTime = 0;
		
		for (const leaf of markdownLeaves) {
			if (leaf.view?.editor && leaf.view.file) {
				const leafTime = leaf.activeTime || leaf.view.file.stat?.mtime || 0;
				if (leafTime > mostRecentTime) {
					mostRecentTime = leafTime;
					mostRecentEditor = leaf.view.editor;
				}
			}
		}
		
		if (mostRecentEditor) {
			this.currentEditor = mostRecentEditor;
		}
		
		return this.currentEditor;
	}
	
	getCurrentFilePath() {
		const editor = this.getCurrentEditor();
		if (!editor) return null;
		
		// Find the leaf/view associated with this editor
		const leaves = this.app.workspace.getLeavesOfType("markdown");
		for (const leaf of leaves) {
			if (leaf.view?.editor === editor && leaf.view?.file) {
				return leaf.view.file.path;
			}
		}
		return null;
	}

	loadPreset(p) {
		this.pattern = p.pattern;
		this.replacement = p.replacement;
		this.flags = p.flags;
		this.onlySelection = p.onlySelection;
		this.replaceAll = p.replaceAll;

		if (this.controls.pattern) this.controls.pattern.setValue(this.pattern);
		if (this.controls.replacement) this.controls.replacement.setValue(this.replacement);
		if (this.controls.flags) this.controls.flags.setValue(this.flags);
		if (this.controls.onlySelection) this.controls.onlySelection.setValue(this.onlySelection);
		if (this.controls.replaceAll) this.controls.replaceAll.setValue(this.replaceAll);

		this.updatePreview();
	}

	updatePreview() {
		// Clear any pending preview update
		if (this.previewTimeout) {
			clearTimeout(this.previewTimeout);
		}

		// Only auto-update if autoPreview is enabled
		if (!this.autoPreview) {
			return;
		}

		// Debounce the preview update
		this.previewTimeout = setTimeout(() => {
			const previewEl = this.containerEl.querySelector('.regex-preview-results');
			if (previewEl) {
				this.showPreview(previewEl);
			}
		}, DEBOUNCE_DELAY);
	}

	showPreview(previewEl) {
		previewEl.empty();
		
		const editor = this.getCurrentEditor();
		if (!editor) {
			previewEl.createEl("div", { 
				text: "No editor found",
				attr: { style: "color: var(--text-muted); font-style: italic; padding: 8px;" }
			});
			return;
		}

		let flags = this.flags;
		if (!flags.includes("g")) flags += "g";

		let regex;
		try {
			if (!this.pattern) {
				previewEl.createEl("div", { 
					text: "Enter pattern",
					attr: { style: "color: var(--text-muted); font-style: italic; padding: 8px;" }
				});
				return;
			}
			// Interpret escape sequences in pattern for preview
			const interpretedPattern = this.interpretEscapeSequences(this.pattern);
			regex = new RegExp(interpretedPattern, flags);
		} catch (e) {
			return previewEl.createEl("div", { 
				text: "Invalid regex: " + e.message,
				attr: { style: "color: var(--text-error); padding: 8px;" }
			});
		}

		const text = this.onlySelection ? editor.getSelection() : editor.getValue();
		
		if (!text) {
			previewEl.createEl("div", { 
				text: this.onlySelection ? "No selection" : "Empty document",
				attr: { style: "color: var(--text-muted); font-style: italic; padding: 8px;" }
			});
			return;
		}

		// Safety check: warn if text is very large
		const currentFilePath = this.getCurrentFilePath();
		const fileApproved = currentFilePath && this.approvedLargeFiles.has(currentFilePath);
		
		if (text.length > MAX_TEXT_LENGTH_FOR_AUTO_PREVIEW && !fileApproved) {
			const warning = previewEl.createEl("div", {
				attr: { style: "padding: 12px; background: var(--background-secondary); border: 2px solid var(--interactive-accent); border-radius: 4px; margin: 8px;" }
			});
			warning.createEl("div", {
				text: "⚠️ Large document detected",
				attr: { style: "font-weight: 600; margin-bottom: 4px; color: var(--text-normal);" }
			});
			warning.createEl("div", {
				text: `Document has ${text.length.toLocaleString()} characters. Preview may be slow.`,
				attr: { style: "font-size: 0.85em; margin-bottom: 8px; color: var(--text-muted);" }
			});
			const manualBtn = warning.createEl("button", {
				text: "Generate Preview Anyway",
				attr: { style: "padding: 4px 8px; font-size: 0.85em; cursor: pointer; background: var(--interactive-accent); color: var(--text-on-accent); border: none; border-radius: 3px;" }
			});
			manualBtn.addEventListener("click", () => {
				if (currentFilePath) {
					this.approvedLargeFiles.add(currentFilePath);
				}
				this.showPreviewUnsafe(previewEl, text, regex);
			});
			return;
		}

		this.showPreviewUnsafe(previewEl, text, regex);
	}

	showPreviewUnsafe(previewEl, text, regex) {
		previewEl.empty();

		let matches;
		try {
			matches = [...text.matchAll(regex)];
		} catch (e) {
			return previewEl.createEl("div", { 
				text: "Error matching regex: " + e.message,
				attr: { style: "color: var(--text-error); padding: 8px;" }
			});
		}

		if (matches.length === 0) {
			previewEl.createEl("div", { 
				text: "No matches",
				attr: { style: "color: var(--text-muted); font-style: italic; padding: 8px;" }
			});
			return;
		}

		const displayCount = Math.min(matches.length, MAX_MATCHES_TO_DISPLAY);
		const hasMore = matches.length > MAX_MATCHES_TO_DISPLAY;

		// Count display at top
		const countEl = previewEl.createEl("div", {
			text: `${matches.length} match${matches.length !== 1 ? 'es' : ''}${hasMore ? ` (showing first ${displayCount})` : ''}`,
			attr: { style: "padding: 6px 8px; font-weight: 600; background: var(--background-secondary); border-bottom: 1px solid var(--background-modifier-border); position: sticky; top: 0; z-index: 1;" }
		});

		for (let i = 0; i < displayCount; i++) {
			const matchResult = matches[i];
			const match = matchResult[0];
			const matchStart = matchResult.index;
			const matchEnd = matchStart + match.length;

			const textBeforeMatch = text.slice(0, matchStart);
			const lineNumber = textBeforeMatch.split('\n').length - 1;
			const lineStart = textBeforeMatch.lastIndexOf('\n') + 1;
			const characterPosition = matchStart - lineStart;

			const contextStart = Math.max(0, matchStart - 20);
			const contextEnd = Math.min(text.length, matchEnd + 20);
			
			const beforeContext = text.slice(contextStart, matchStart);
			const afterContext = text.slice(matchEnd, contextEnd);
			
			let replacement;
			try {
				// Interpret escape sequences in replacement for preview
				const interpretedReplacement = this.interpretEscapeSequences(this.replacement);
				replacement = match.replace(new RegExp(this.interpretEscapeSequences(this.pattern), this.flags.replace('g', '')), interpretedReplacement);
			} catch (e) {
				replacement = "[Error in replacement]";
			}

			const matchBox = previewEl.createEl("div", {
				attr: { 
					style: "margin: 4px; padding: 6px; background: var(--background-secondary); border: 1px solid var(--background-modifier-border); border-radius: 4px; cursor: pointer; transition: all 0.2s;",
					title: `Click to jump to line ${lineNumber + 1}`
				}
			});

			matchBox.addEventListener('mouseenter', () => {
				matchBox.style.background = 'var(--background-modifier-hover)';
				matchBox.style.borderColor = 'var(--interactive-accent)';
			});
			matchBox.addEventListener('mouseleave', () => {
				matchBox.style.background = 'var(--background-secondary)';
				matchBox.style.borderColor = 'var(--background-modifier-border)';
			});

			matchBox.addEventListener('click', () => {
				const targetEditor = this.getCurrentEditor();
				if (targetEditor) {
					targetEditor.setCursor({ line: lineNumber, ch: characterPosition });
					targetEditor.setSelection(
						{ line: lineNumber, ch: characterPosition },
						{ line: lineNumber, ch: characterPosition + match.length }
					);
					targetEditor.focus();
					targetEditor.scrollIntoView({ line: lineNumber, ch: characterPosition });
					new Notice(`Match ${i + 1}/${matches.length}`);
				}
			});

			// Match number and location
			matchBox.createEl("div", {
				text: `#${i + 1} · Line ${lineNumber + 1}`,
				attr: { style: "font-size: 0.7em; color: var(--text-muted); margin-bottom: 4px;" }
			});

			// Before
			const beforeDiv = matchBox.createEl("div", { attr: { style: "font-family: var(--font-monospace); font-size: 0.75em; margin-bottom: 2px; word-break: break-all;" }});
			beforeDiv.innerHTML = '<span style="color: var(--text-faint);">' + this.escapeHtml(beforeContext) + '</span><span style="background: var(--text-selection); font-weight: bold; padding: 1px 2px;">' + this.escapeHtml(match) + '</span><span style="color: var(--text-faint);">' + this.escapeHtml(afterContext) + '</span>';

			// Arrow
			matchBox.createEl("div", {
				text: "↓",
				attr: { style: "text-align: center; color: var(--text-accent); font-size: 0.8em; margin: 2px 0;" }
			});

			// After
			const afterDiv = matchBox.createEl("div", { attr: { style: "font-family: var(--font-monospace); font-size: 0.75em; word-break: break-all;" }});
			afterDiv.innerHTML = '<span style="color: var(--text-faint);">' + this.escapeHtml(beforeContext) + '</span><span style="background: var(--text-accent); color: var(--text-on-accent); font-weight: bold; padding: 1px 2px;">' + this.escapeHtml(replacement) + '</span><span style="color: var(--text-faint);">' + this.escapeHtml(afterContext) + '</span>';
		}

		if (hasMore) {
			previewEl.createEl("div", {
				text: `... and ${matches.length - displayCount} more matches`,
				attr: { style: "padding: 12px; text-align: center; color: var(--text-muted); font-style: italic; background: var(--background-secondary); margin: 4px; border-radius: 4px;" }
			});
		}
	}

	escapeHtml(text) {
		const div = document.createElement('div');
		div.textContent = text;
		return div.innerHTML;
	}

	interpretEscapeSequences(str) {
		// Convert common escape sequences to their actual characters
		return str
			.replace(/\\n/g, '\n')
			.replace(/\\r/g, '\r')
			.replace(/\\t/g, '\t')
			.replace(/\\0/g, '\0')
			.replace(/\\\\/g, '\\'); // Must be last to handle escaped backslashes
	}

	executeReplace(editor = null) {
		const targetEditor = editor || this.getCurrentEditor();
		if (!targetEditor) {
			new Notice("No active editor found.");
			return;
		}

		try {
			let regexFlags = (this.flags || "").toString();
			if (!this.replaceAll) regexFlags = regexFlags.replace("g", "");
			
			// Interpret escape sequences in both pattern and replacement
			const interpretedPattern = this.interpretEscapeSequences(this.pattern);
			const interpretedReplacement = this.interpretEscapeSequences(this.replacement);
			
			const regex = new RegExp(interpretedPattern, regexFlags);

			if (this.onlySelection) {
				const sel = targetEditor.getSelection();
				if (!sel) return new Notice("No selection found.");
				targetEditor.replaceSelection(sel.replace(regex, interpretedReplacement));
			} else {
				const cursorPos = targetEditor.getCursor();
				const scrollInfo = targetEditor.getScrollInfo();
				
				const originalContent = targetEditor.getValue();
				const newContent = originalContent.replace(regex, interpretedReplacement);
				
				if (newContent !== originalContent) {
					targetEditor.setValue(newContent);
					
					try {
						const lineCount = targetEditor.lineCount();
						const targetLine = Math.min(cursorPos.line, lineCount - 1);
						const lineLength = targetEditor.getLine(targetLine)?.length || 0;
						const targetCh = Math.min(cursorPos.ch, lineLength);
						
						targetEditor.setCursor({ line: targetLine, ch: targetCh });
						targetEditor.scrollTo(scrollInfo.left, scrollInfo.top);
					} catch (e) {
						targetEditor.setCursor(0, 0);
					}
				}
			}

			this.plugin.settings = { 
				...this.plugin.settings, 
				pattern: this.pattern, 
				replacement: this.replacement, 
				flags: this.flags, 
				onlySelection: this.onlySelection, 
				replaceAll: this.replaceAll,
				autoPreview: this.autoPreview
			};
			this.plugin.saveData(this.plugin.settings);
			
			new Notice("Replace successful!");
			
			// Manual preview update after replace
			const previewEl = this.containerEl.querySelector('.regex-preview-results');
			if (previewEl) {
				this.showPreview(previewEl);
			}
		} catch (err) {
			new Notice("Regex error: " + err);
		}
	}

	async onOpen() {
		const container = this.containerEl.children[1];
		container.empty();
		container.addClass("regex-replace-sidebar");

		// Add compact CSS
		container.createEl("style", {
			text: `
				.regex-replace-sidebar {
					display: flex;
					flex-direction: column;
					height: 100%;
					padding: 8px;
				}
				.regex-compact-controls {
					flex-shrink: 0;
					margin-bottom: 8px;
				}
				.regex-preview-container {
					flex: 1;
					min-height: 0;
					overflow-y: auto;
					border: 1px solid var(--background-modifier-border);
					border-radius: 4px;
					background: var(--background-primary);
				}
				.regex-preview-results {
					height: 100%;
				}
				.regex-action-bar {
					flex-shrink: 0;
					margin-top: 8px;
					display: flex;
					gap: 4px;
				}
				.regex-action-bar button {
					flex: 1;
					padding: 6px;
					font-size: 0.85em;
				}
				.regex-input {
					width: 100%;
					padding: 4px 6px;
					font-size: 0.85em;
					font-family: var(--font-monospace);
					border: 1px solid var(--background-modifier-border);
					border-radius: 4px;
					background: var(--background-primary);
					color: var(--text-normal);
					margin-bottom: 4px;
				}
				.regex-input:focus {
					outline: none;
					border-color: var(--interactive-accent);
				}
				.regex-label {
					font-size: 0.75em;
					font-weight: 500;
					color: var(--text-muted);
					margin-bottom: 2px;
					display: block;
				}
				.regex-flags-row {
					display: flex;
					gap: 8px;
					align-items: center;
					margin-bottom: 4px;
				}
				.regex-flags-input {
					flex: 1;
					padding: 4px 6px;
					font-size: 0.85em;
					border: 1px solid var(--background-modifier-border);
					border-radius: 4px;
					background: var(--background-primary);
					color: var(--text-normal);
				}
				.regex-toggle-group {
					display: flex;
					gap: 4px;
				}
				.regex-toggle-btn {
					padding: 4px 8px;
					font-size: 0.7em;
					border: 1px solid var(--background-modifier-border);
					border-radius: 3px;
					background: var(--background-secondary);
					color: var(--text-muted);
					cursor: pointer;
					transition: all 0.2s;
				}
				.regex-toggle-btn.active {
					background: var(--interactive-accent);
					color: var(--text-on-accent);
					border-color: var(--interactive-accent);
				}
				.regex-preset-header {
					display: flex;
					gap: 4px;
					margin-bottom: 6px;
				}
				.regex-preset-dropdown {
					flex: 1;
					padding: 4px 6px;
					font-size: 0.8em;
					border: 1px solid var(--background-modifier-border);
					border-radius: 4px;
					background: var(--background-primary);
				}
				.regex-menu-btn {
					padding: 4px 8px;
					font-size: 0.8em;
					border: 1px solid var(--background-modifier-border);
					border-radius: 4px;
					background: var(--background-secondary);
					cursor: pointer;
				}
			`
		});

		const controlsDiv = container.createDiv("regex-compact-controls");

		// Preset management
		const presetHeader = controlsDiv.createDiv("regex-preset-header");
		const presetDropdown = presetHeader.createEl("select", { cls: "regex-preset-dropdown" });
		presetDropdown.createEl("option", { text: "Load preset...", value: "" });
		this.plugin.settings.presets.forEach(p => {
			presetDropdown.createEl("option", { text: p.name, value: p.name });
		});

		presetDropdown.addEventListener("change", (e) => {
			const val = e.target.value;
			if (val) {
				const preset = this.plugin.settings.presets.find(p => p.name === val);
				if (preset) {
					this.loadPreset(preset);
					new Notice("Loaded: " + val);
				}
				presetDropdown.value = "";
			}
		});

		const menuBtn = presetHeader.createEl("button", { text: "⋮", cls: "regex-menu-btn" });
		menuBtn.addEventListener("click", (e) => {
			const menu = new Menu();
			
			menu.addItem((item) =>
				item.setTitle("Save current as preset").setIcon("save").onClick(() => {
					new PresetNameModal(this.app, (name) => {
						this.plugin.settings.presets = this.plugin.settings.presets.filter(p => p.name !== name);
						this.plugin.settings.presets.push({
							name,
							pattern: this.pattern,
							replacement: this.replacement,
							flags: this.flags,
							onlySelection: this.onlySelection,
							replaceAll: this.replaceAll
						});
						this.plugin.saveData(this.plugin.settings);
						
						// Refresh dropdown
						presetDropdown.innerHTML = "";
						presetDropdown.createEl("option", { text: "Load preset...", value: "" });
						this.plugin.settings.presets.forEach(p => {
							presetDropdown.createEl("option", { text: p.name, value: p.name });
						});
						
						new Notice("Preset saved: " + name);
					}).open();
				})
			);

			if (this.plugin.settings.presets.length > 0) {
				menu.addSeparator();
				menu.addItem((item) =>
					item.setTitle("Delete preset...").setIcon("trash").onClick(() => {
						const deleteMenu = new Menu();
						this.plugin.settings.presets.forEach(p => {
							deleteMenu.addItem((delItem) =>
								delItem.setTitle(p.name).onClick(async () => {
									this.plugin.settings.presets = this.plugin.settings.presets.filter(pr => pr.name !== p.name);
									await this.plugin.saveData(this.plugin.settings);
									
									presetDropdown.innerHTML = "";
									presetDropdown.createEl("option", { text: "Load preset...", value: "" });
									this.plugin.settings.presets.forEach(pr => {
										presetDropdown.createEl("option", { text: pr.name, value: pr.name });
									});
									
									new Notice("Deleted: " + p.name);
								})
							);
						});
						deleteMenu.showAtMouseEvent(e);
					})
				);
			}

			menu.addSeparator();
			menu.addItem((item) =>
				item.setTitle(this.autoPreview ? "Disable auto-preview" : "Enable auto-preview")
					.setIcon(this.autoPreview ? "eye-off" : "eye")
					.onClick(() => {
						this.autoPreview = !this.autoPreview;
						this.plugin.settings.autoPreview = this.autoPreview;
						this.plugin.saveData(this.plugin.settings);
						new Notice(this.autoPreview ? "Auto-preview enabled" : "Auto-preview disabled - use Refresh button");
					})
			);

			menu.showAtMouseEvent(e);
		});

		// Pattern input
		controlsDiv.createEl("span", { text: "Pattern", cls: "regex-label" });
		const patternInput = controlsDiv.createEl("input", { cls: "regex-input", value: this.pattern });
		patternInput.addEventListener("input", (e) => {
			this.pattern = e.target.value;
			this.updatePreview();
		});
		this.controls.pattern = { setValue: (v) => patternInput.value = v };

		// Replacement input
		controlsDiv.createEl("span", { text: "Replacement", cls: "regex-label" });
		const replacementInput = controlsDiv.createEl("input", { cls: "regex-input", value: this.replacement });
		replacementInput.addEventListener("input", (e) => {
			this.replacement = e.target.value;
			this.updatePreview();
		});
		this.controls.replacement = { setValue: (v) => replacementInput.value = v };

		// Flags and toggles row
		const flagsRow = controlsDiv.createDiv("regex-flags-row");
		
		const flagsInput = flagsRow.createEl("input", { cls: "regex-flags-input", value: this.flags, attr: { placeholder: "gim" } });
		flagsInput.addEventListener("input", (e) => {
			this.flags = e.target.value;
			this.updatePreview();
		});
		this.controls.flags = { setValue: (v) => flagsInput.value = v };

		const toggleGroup = flagsRow.createDiv("regex-toggle-group");
		
		const selToggle = toggleGroup.createEl("button", { text: "Sel", cls: "regex-toggle-btn" });
		if (this.onlySelection) selToggle.addClass("active");
		selToggle.addEventListener("click", () => {
			this.onlySelection = !this.onlySelection;
			selToggle.toggleClass("active", this.onlySelection);
			this.updatePreview();
		});
		this.controls.onlySelection = { setValue: (v) => { this.onlySelection = v; selToggle.toggleClass("active", v); }};

		const allToggle = toggleGroup.createEl("button", { text: "All", cls: "regex-toggle-btn" });
		if (this.replaceAll) allToggle.addClass("active");
		allToggle.addEventListener("click", () => {
			this.replaceAll = !this.replaceAll;
			allToggle.toggleClass("active", this.replaceAll);
			this.updatePreview();
		});
		this.controls.replaceAll = { setValue: (v) => { this.replaceAll = v; allToggle.toggleClass("active", v); }};

		// Preview container
		const previewContainer = container.createDiv("regex-preview-container");
		const previewEl = previewContainer.createDiv("regex-preview-results");

		// Action bar
		const actionBar = container.createDiv("regex-action-bar");
		const refreshBtn = actionBar.createEl("button", { text: "↻ Refresh" });
		refreshBtn.addEventListener("click", () => {
			// Force immediate preview update
			if (this.previewTimeout) {
				clearTimeout(this.previewTimeout);
			}
			this.showPreview(previewEl);
		});

		const executeBtn = actionBar.createEl("button", { text: "Execute", cls: "mod-cta" });
		executeBtn.addEventListener("click", () => this.executeReplace());

		// Initial preview
		this.updatePreview();

		this.registerEvent(
			this.app.workspace.on("active-leaf-change", () => {
				this.currentEditor = null;
				this.updatePreview();
			})
		);
	}

	async onClose() {
		// Clear any pending timeouts
		if (this.previewTimeout) {
			clearTimeout(this.previewTimeout);
		}

		this.plugin.settings = { 
			...this.plugin.settings, 
			pattern: this.pattern, 
			replacement: this.replacement, 
			flags: this.flags, 
			onlySelection: this.onlySelection, 
			replaceAll: this.replaceAll,
			autoPreview: this.autoPreview
		};
		await this.plugin.saveData(this.plugin.settings);
	}
}

class PresetNameModal extends Modal {
	constructor(app, onSubmit) {
		super(app);
		this.onSubmit = onSubmit;
	}

	onOpen() {
		const { contentEl } = this;
		contentEl.createEl("h2", { text: "Save Preset" });

		let name = "";

		new Setting(contentEl)
			.setName("Preset name")
			.addText((t) => t.setPlaceholder("e.g. Swap Names").onChange((val) => (name = val)));

		new Setting(contentEl)
			.addButton((b) => b.setButtonText("Save").setCta().onClick(() => {
				if (name) {
					this.close();
					this.onSubmit(name);
				}
			}))
			.addButton((b) => b.setButtonText("Cancel").onClick(() => this.close()));
	}

	onClose() {
		this.contentEl.empty();
	}
}

(main.js)

Edited file to ensure better sidebar element space management and added safety debounce and ability to show preview for file per session if allowed to generate once already.

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