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RegexWB

Regular Expression Workbench (v2 by Eric Gunnerson)

About

Regular Expression Workbench is a small tool that allows you to experiment with and test .NET regular expressions. While some "cheat" sheets exist ( see RegexLib.com or Regegg.com ) and some great books (e.g., Mastering Regular Expressions the expressions can quickly become complex and its not always apparent that they work (or why they don't work). This tool is a handy "open source" tool that can be used to explore and iteratively develop regular expressions.

Reference

Eric Gunnerson had posted the announcement of the v2.0 code on his blog, which linked to gotdotnet. Unfortunately that site is now defunct and the source code is now unreachable. However, I had taken a snapshot of the code back in 2006 and contacted Eric for his permission to publish it here on github (or to see if he had already done so).

#Details Please see short descriptive file for more details

#Alternatives Expresso and Regulator - see Regulator Code have been around for a long time, however Expresso is closed-source and back when I grabbed the Regular Expression Workbench code I think Regulator was not fully open sourced.

About

Regular Expression Workbench (v2 by Eric Gunnerson)

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Readme
MIT license
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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
GitHub - amihalcin/RegexWB: Regular Expression Workbench (v2 by Eric Gunnerson) · GitHub
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RegexWB
Regular Expression Workbench (v2 by Eric Gunnerson)
About
Regular Expression Workbench is a small tool that allows you to experiment with and test .NET regular expressions. While some "cheat" sheets exist ( see RegexLib.com or Regegg.com ) and some great books (e.g., Mastering Regular Expressions the expressions can quickly become complex and its not always apparent that they work (or why they don't work). This tool is a handy "open source" tool that can be used to explore and iteratively develop regular expressions.
Reference
Eric Gunnerson had posted the announcement of the v2.0 code on his blog, which linked to gotdotnet. Unfortunately that site is now defunct and the source code is now unreachable. However, I had taken a snapshot of the code back in 2006 and contacted Eric for his permission to publish it here on github (or to see if he had already done so).
#Details
Please see short descriptive file for more details
#Alternatives
Expresso and Regulator - see Regulator Code have been around for a long time, however Expresso is closed-source and back when I grabbed the Regular Expression Workbench code I think Regulator was not fully open sourced.
About
Regular Expression Workbench (v2 by Eric Gunnerson)
Resources
Readme
MIT license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - amihalcin/RegexWB: Regular Expression Workbench (v2 by Eric Gunnerson) · GitHub
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RegexWB
Regular Expression Workbench (v2 by Eric Gunnerson)
About
Regular Expression Workbench is a small tool that allows you to experiment with and test .NET regular expressions. While some "cheat" sheets exist ( see RegexLib.com or Regegg.com ) and some great books (e.g., Mastering Regular Expressions the expressions can quickly become complex and its not always apparent that they work (or why they don't work). This tool is a handy "open source" tool that can be used to explore and iteratively develop regular expressions.
Reference
Eric Gunnerson had posted the announcement of the v2.0 code on his blog, which linked to gotdotnet. Unfortunately that site is now defunct and the source code is now unreachable. However, I had taken a snapshot of the code back in 2006 and contacted Eric for his permission to publish it here on github (or to see if he had already done so).
#Details
Please see short descriptive file for more details
#Alternatives
Expresso and Regulator - see Regulator Code have been around for a long time, however Expresso is closed-source and back when I grabbed the Regular Expression Workbench code I think Regulator was not fully open sourced.
About
Regular Expression Workbench (v2 by Eric Gunnerson)
Resources
Readme
MIT license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
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Packages
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - amihalcin/RegexWB: Regular Expression Workbench (v2 by Eric Gunnerson) · GitHub
Skip to content
BranchesTags
Repository files navigation
RegexWB
Regular Expression Workbench (v2 by Eric Gunnerson)
About
Regular Expression Workbench is a small tool that allows you to experiment with and test .NET regular expressions. While some "cheat" sheets exist ( see RegexLib.com or Regegg.com ) and some great books (e.g., Mastering Regular Expressions the expressions can quickly become complex and its not always apparent that they work (or why they don't work). This tool is a handy "open source" tool that can be used to explore and iteratively develop regular expressions.
Reference
Eric Gunnerson had posted the announcement of the v2.0 code on his blog, which linked to gotdotnet. Unfortunately that site is now defunct and the source code is now unreachable. However, I had taken a snapshot of the code back in 2006 and contacted Eric for his permission to publish it here on github (or to see if he had already done so).
#Details
Please see short descriptive file for more details
#Alternatives
Expresso and Regulator - see Regulator Code have been around for a long time, however Expresso is closed-source and back when I grabbed the Regular Expression Workbench code I think Regulator was not fully open sourced.
About
Regular Expression Workbench (v2 by Eric Gunnerson)
Resources
Readme
MIT license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
GitHub - amihalcin/RegexWB: Regular Expression Workbench (v2 by Eric Gunnerson) · GitHub
Skip to content
BranchesTags
Repository files navigation
RegexWB
Regular Expression Workbench (v2 by Eric Gunnerson)
About
Regular Expression Workbench is a small tool that allows you to experiment with and test .NET regular expressions. While some "cheat" sheets exist ( see RegexLib.com or Regegg.com ) and some great books (e.g., Mastering Regular Expressions the expressions can quickly become complex and its not always apparent that they work (or why they don't work). This tool is a handy "open source" tool that can be used to explore and iteratively develop regular expressions.
Reference
Eric Gunnerson had posted the announcement of the v2.0 code on his blog, which linked to gotdotnet. Unfortunately that site is now defunct and the source code is now unreachable. However, I had taken a snapshot of the code back in 2006 and contacted Eric for his permission to publish it here on github (or to see if he had already done so).
#Details
Please see short descriptive file for more details
#Alternatives
Expresso and Regulator - see Regulator Code have been around for a long time, however Expresso is closed-source and back when I grabbed the Regular Expression Workbench code I think Regulator was not fully open sourced.
About
Regular Expression Workbench (v2 by Eric Gunnerson)
Resources
Readme
MIT license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - amihalcin/RegexWB: Regular Expression Workbench (v2 by Eric Gunnerson) · GitHub
Skip to content
BranchesTags
Repository files navigation
RegexWB
Regular Expression Workbench (v2 by Eric Gunnerson)
About
Regular Expression Workbench is a small tool that allows you to experiment with and test .NET regular expressions. While some "cheat" sheets exist ( see RegexLib.com or Regegg.com ) and some great books (e.g., Mastering Regular Expressions the expressions can quickly become complex and its not always apparent that they work (or why they don't work). This tool is a handy "open source" tool that can be used to explore and iteratively develop regular expressions.
Reference
Eric Gunnerson had posted the announcement of the v2.0 code on his blog, which linked to gotdotnet. Unfortunately that site is now defunct and the source code is now unreachable. However, I had taken a snapshot of the code back in 2006 and contacted Eric for his permission to publish it here on github (or to see if he had already done so).
#Details
Please see short descriptive file for more details
#Alternatives
Expresso and Regulator - see Regulator Code have been around for a long time, however Expresso is closed-source and back when I grabbed the Regular Expression Workbench code I think Regulator was not fully open sourced.
About
Regular Expression Workbench (v2 by Eric Gunnerson)
Resources
Readme
MIT license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - amihalcin/RegexWB: Regular Expression Workbench (v2 by Eric Gunnerson) · GitHub
Skip to content
BranchesTags
Repository files navigation
RegexWB
Regular Expression Workbench (v2 by Eric Gunnerson)
About
Regular Expression Workbench is a small tool that allows you to experiment with and test .NET regular expressions. While some "cheat" sheets exist ( see RegexLib.com or Regegg.com ) and some great books (e.g., Mastering Regular Expressions the expressions can quickly become complex and its not always apparent that they work (or why they don't work). This tool is a handy "open source" tool that can be used to explore and iteratively develop regular expressions.
Reference
Eric Gunnerson had posted the announcement of the v2.0 code on his blog, which linked to gotdotnet. Unfortunately that site is now defunct and the source code is now unreachable. However, I had taken a snapshot of the code back in 2006 and contacted Eric for his permission to publish it here on github (or to see if he had already done so).
#Details
Please see short descriptive file for more details
#Alternatives
Expresso and Regulator - see Regulator Code have been around for a long time, however Expresso is closed-source and back when I grabbed the Regular Expression Workbench code I think Regulator was not fully open sourced.
About
Regular Expression Workbench (v2 by Eric Gunnerson)
Resources
Readme
MIT license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
GitHub - amihalcin/RegexWB: Regular Expression Workbench (v2 by Eric Gunnerson) · GitHub
Skip to content
BranchesTags
Repository files navigation
RegexWB
Regular Expression Workbench (v2 by Eric Gunnerson)
About
Regular Expression Workbench is a small tool that allows you to experiment with and test .NET regular expressions. While some "cheat" sheets exist ( see RegexLib.com or Regegg.com ) and some great books (e.g., Mastering Regular Expressions the expressions can quickly become complex and its not always apparent that they work (or why they don't work). This tool is a handy "open source" tool that can be used to explore and iteratively develop regular expressions.
Reference
Eric Gunnerson had posted the announcement of the v2.0 code on his blog, which linked to gotdotnet. Unfortunately that site is now defunct and the source code is now unreachable. However, I had taken a snapshot of the code back in 2006 and contacted Eric for his permission to publish it here on github (or to see if he had already done so).
#Details
Please see short descriptive file for more details
#Alternatives
Expresso and Regulator - see Regulator Code have been around for a long time, however Expresso is closed-source and back when I grabbed the Regular Expression Workbench code I think Regulator was not fully open sourced.
About
Regular Expression Workbench (v2 by Eric Gunnerson)
Resources
Readme
MIT license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages