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Search and highlight text using regex patterns on any webpage
// ==UserScript==
// @name Regex Search & Highlight
// @namespace http://tampermonkey.net/
// @version 1.0
// @description Search and highlight text using regex patterns on any webpage
// @author AnyPortInAHurricane & ClaudeAI
// @match *://*/*
// @grant GM_addStyle
// @run-at document-idle
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// Add CSS styles
GM_addStyle(`
#regex-search-panel {
position: fixed;
top: 10px;
right: 10px;
z-index: 999999;
background: #fff;
border: 2px solid #333;
border-radius: 8px;
padding: 15px;
box-shadow: 0 4px 12px rgba(0,0,0,0.3);
font-family: Arial, sans-serif;
min-width: 320px;
}
#regex-search-panel.minimized {
min-width: auto;
}
#regex-search-panel h3 {
margin: 0 0 10px 0;
font-size: 16px;
color: #333;
display: flex;
justify-content: space-between;
align-items: center;
}
#regex-search-panel input[type="text"] {
width: 100%;
padding: 8px;
margin-bottom: 8px;
border: 1px solid #ccc;
border-radius: 4px;
font-family: monospace;
box-sizing: border-box;
}
#regex-search-panel label {
display: block;
margin: 8px 0;
font-size: 13px;
}
#regex-search-panel input[type="checkbox"] {
margin-right: 5px;
}
#regex-search-panel button {
padding: 8px 15px;
margin: 5px 5px 0 0;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 13px;
font-weight: bold;
}
#regex-search-btn {
background: #4CAF50;
color: white;
}
#regex-search-btn:hover {
background: #45a049;
}
#regex-clear-btn {
background: #f44336;
color: white;
}
#regex-clear-btn:hover {
background: #da190b;
}
#regex-toggle-btn {
background: none;
border: none;
cursor: pointer;
font-size: 18px;
padding: 0;
color: #666;
}
#regex-match-count {
margin-top: 8px;
font-size: 13px;
color: #666;
font-weight: bold;
}
.regex-highlight {
background-color: yellow !important;
color: black !important;
padding: 2px 0;
border-radius: 2px;
}
.regex-search-content {
display: block;
}
.regex-search-content.hidden {
display: none;
}
`);
// Create the search panel
const panel = document.createElement('div');
panel.id = 'regex-search-panel';
panel.className = 'minimized';
panel.innerHTML = `
<h3>
Regex Search
<button id="regex-toggle-btn" title="Minimize/Maximize">+</button>
</h3>
<div class="regex-search-content hidden">
<input type="text" id="regex-pattern" placeholder="Enter regex pattern (e.g., \\b\\w+@\\w+\\.com\\b)" />
<label>
<input type="checkbox" id="regex-case-sensitive" />
Case sensitive
</label>
<label>
<input type="checkbox" id="regex-whole-word" />
Whole word only
</label>
<div>
<button id="regex-search-btn">Search & Highlight</button>
<button id="regex-clear-btn">Clear</button>
</div>
<div id="regex-match-count"></div>
</div>
`;
// Wait for body to be available
const addPanel = () => {
if (document.body) {
document.body.appendChild(panel);
} else {
setTimeout(addPanel, 100);
}
};
addPanel();
// Store original content for restoration
let modifiedElements = [];
let matchCount = 0;
// Toggle minimize/maximize
document.addEventListener('click', (e) => {
if (e.target.id === 'regex-toggle-btn') {
const content = panel.querySelector('.regex-search-content');
const btn = e.target;
if (content.classList.contains('hidden')) {
content.classList.remove('hidden');
btn.textContent = '−';
panel.classList.remove('minimized');
} else {
content.classList.add('hidden');
btn.textContent = '+';
panel.classList.add('minimized');
}
}
});
// Function to get all text nodes
function getTextNodes(node) {
const textNodes = [];
const walker = document.createTreeWalker(
node,
NodeFilter.SHOW_TEXT,
{
acceptNode: (node) => {
// Skip script, style, and our panel
const parent = node.parentElement;
if (!parent) return NodeFilter.FILTER_REJECT;
const tag = parent.tagName;
if (tag === 'SCRIPT' || tag === 'STYLE' || tag === 'NOSCRIPT') {
return NodeFilter.FILTER_REJECT;
}
if (parent.closest('#regex-search-panel')) {
return NodeFilter.FILTER_REJECT;
}
// Only accept nodes with actual content
if (node.textContent.trim().length === 0) {
return NodeFilter.FILTER_REJECT;
}
return NodeFilter.FILTER_ACCEPT;
}
}
);
let currentNode;
while (currentNode = walker.nextNode()) {
textNodes.push(currentNode);
}
return textNodes;
}
// Function to highlight matches
function highlightMatches(pattern, caseSensitive, wholeWord) {
clearHighlights();
matchCount = 0;
let flags = 'g';
if (!caseSensitive) flags += 'i';
let regex;
try {
if (wholeWord) {
regex = new RegExp(`\\b(${pattern})\\b`, flags);
} else {
regex = new RegExp(pattern, flags);
}
} catch (e) {
document.getElementById('regex-match-count').textContent = `Error: Invalid regex pattern`;
return;
}
const textNodes = getTextNodes(document.body);
textNodes.forEach(node => {
const text = node.textContent;
const matches = [...text.matchAll(regex)];
if (matches.length > 0) {
matchCount += matches.length;
// Create a document fragment with highlighted text
const fragment = document.createDocumentFragment();
let lastIndex = 0;
matches.forEach(match => {
// Add text before match
if (match.index > lastIndex) {
fragment.appendChild(document.createTextNode(text.substring(lastIndex, match.index)));
}
// Add highlighted match
const span = document.createElement('span');
span.className = 'regex-highlight';
span.textContent = match[0];
fragment.appendChild(span);
lastIndex = match.index + match[0].length;
});
// Add remaining text
if (lastIndex < text.length) {
fragment.appendChild(document.createTextNode(text.substring(lastIndex)));
}
// Store original node and replace
modifiedElements.push({
node: node,
original: text,
parent: node.parentNode
});
node.parentNode.replaceChild(fragment, node);
}
});
document.getElementById('regex-match-count').textContent =
`Found ${matchCount} match${matchCount !== 1 ? 'es' : ''}`;
// Scroll to first match
if (matchCount > 0) {
const firstHighlight = document.querySelector('.regex-highlight');
if (firstHighlight) {
firstHighlight.scrollIntoView({ behavior: 'smooth', block: 'center' });
}
}
}
// Function to clear highlights
function clearHighlights() {
// Remove all highlight spans
document.querySelectorAll('.regex-highlight').forEach(span => {
const parent = span.parentNode;
parent.replaceChild(document.createTextNode(span.textContent), span);
parent.normalize(); // Merge adjacent text nodes
});
modifiedElements = [];
matchCount = 0;
document.getElementById('regex-match-count').textContent = '';
}
// Event listeners
document.getElementById('regex-search-btn').addEventListener('click', () => {
const pattern = document.getElementById('regex-pattern').value;
const caseSensitive = document.getElementById('regex-case-sensitive').checked;
const wholeWord = document.getElementById('regex-whole-word').checked;
if (!pattern) {
alert('Please enter a regex pattern');
return;
}
highlightMatches(pattern, caseSensitive, wholeWord);
});
document.getElementById('regex-clear-btn').addEventListener('click', () => {
clearHighlights();
document.getElementById('regex-pattern').value = '';
});
// Allow Enter key to search
document.getElementById('regex-pattern').addEventListener('keypress', (e) => {
if (e.key === 'Enter') {
document.getElementById('regex-search-btn').click();
}
});
// Handle dynamic content changes (for sites like Reddit)
const observer = new MutationObserver(() => {
// Re-apply highlights when DOM changes if there's an active search
if (matchCount > 0) {
const pattern = document.getElementById('regex-pattern').value;
const caseSensitive = document.getElementById('regex-case-sensitive').checked;
const wholeWord = document.getElementById('regex-whole-word').checked;
if (pattern) {
setTimeout(() => highlightMatches(pattern, caseSensitive, wholeWord), 100);
}
}
});
// Start observing with a delay to avoid initial page load chaos
setTimeout(() => {
observer.observe(document.body, {
childList: true,
subtree: true
});
}, 2000);
})();