{"id":65899,"date":"2026-10-14T12:20:28","date_gmt":"2026-10-14T06:50:28","guid":{"rendered":"https:\/\/www.quickonlinetips.com\/archives\/?page_id=65899"},"modified":"2026-10-14T14:30:27","modified_gmt":"2026-10-14T09:00:27","slug":"regex-tester","status":"publish","type":"page","link":"https:\/\/www.quickonlinetips.com\/archives\/tools\/regex-tester\/","title":{"rendered":"Regex Tester: Test Regular Expressions Online"},"content":{"rendered":"<p>This <strong>regex tester<\/strong> checks a regular expression against your text and highlights every match as you type. 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var(--qt-line);border-radius:8px;background:repeating-conic-gradient(#E2E8F0 0 25%,#fff 0 50%) 0 0\/16px 16px} .qt-tool .qt-lb{display:inline-flex;width:44px;height:44px;border-radius:50%;align-items:center;justify-content:center;font-weight:700;font-size:17px;background:#fff;color:#1A202C;border:2px solid var(--qt-accent);margin:3px} .qt-tool .qt-lb.qt-bonus{background:#E53E3E;color:#fff;border-color:#E53E3E} .qt-tool .qt-8{width:230px;height:230px;border-radius:50%;margin:16px auto;background:radial-gradient(circle at 35% 30%,#666,#000 62%);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 10px 24px rgba(0,0,0,.35)} .qt-tool .qt-8 span{width:116px;height:116px;border-radius:50%;background:radial-gradient(circle,#2747a8,#0b1a4a);color:#fff;display:flex;align-items:center;justify-content:center;text-align:center;font-size:13px;font-weight:700;padding:16px;box-sizing:border-box;line-height:1.25;transition:opacity .3s} .qt-tool .qt-shake{animation:qt-shake .7s} @keyframes qt-shake{0%,100%{transform:translate(0)}20%{transform:translate(-12px,4px) rotate(-6deg)}40%{transform:translate(10px,-6px) rotate(5deg)}60%{transform:translate(-8px,6px) rotate(-4deg)}80%{transform:translate(6px,-3px) rotate(3deg)}} .qt-tool .qt-grid>.qt-field{display:flex;flex-direction:column;justify-content:flex-end} .qt-tool .qt-field input[type=range]{height:46px;padding:0 10px} .qt-tool .qt-field input[type=color]{height:46px} .qt-tool .qt-drop .qt-sub{font-weight:400;font-size:14px;margin:4px 0 0} .qt-tool .qt-board{display:grid;gap:5px;margin:14px auto 0;max-width:100%;user-select:none;-webkit-user-select:none;touch-action:manipulation} .qt-tool .qt-cell{display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid #AEC3DB;border-radius:6px;font-weight:700;cursor:pointer;aspect-ratio:1;font-size:clamp(14px,4vw,26px);color:#1A202C;padding:0;min-width:0;font-family:inherit;line-height:1} .qt-tool .qt-cell:disabled{cursor:default} .qt-tool .qt-win{background:#C6F6D5;border-color:#38A169} .qt-tool .qt-sel{background:#BEE3F8;border-color:#3182CE} .qt-tool .qt-bad{background:#FED7D7;border-color:#E53E3E} .qt-tool select{-webkit-appearance:none;-moz-appearance:none;appearance:none;padding-right:40px;cursor:pointer;border:2px solid #90B4DA;font-weight:600;background-color:#fff;background-image:url(\"data:image\/svg+xml,%3Csvg xmlns='http:\/\/www.w3.org\/2000\/svg' viewBox='0 0 14 9'%3E%3Cpath d='M1.5 1.5l5.5 5.5 5.5-5.5' fill='none' stroke='%232B6CB0' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'\/%3E%3C\/svg%3E\");background-repeat:no-repeat;background-position:right 14px center;background-size:14px 9px} .qt-tool select:hover{border-color:var(--qt-accent);background-color:#F4F8FD} .qt-tool select::-ms-expand{display:none} .qt-next{margin:0 0 1.75em} .qt-next .qt-next-h{font-size:14px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:#4A5568;margin:0 0 8px} .qt-next-g{display:grid;grid-template-columns:repeat(3,1fr);gap:8px} .qt-next-g a{display:flex;align-items:center;min-height:46px;padding:9px 12px;border:1px solid #AEC3DB;border-radius:8px;background:#F4F8FD;color:#215387;font-weight:600;font-size:15px;line-height:1.3;text-decoration:none} .qt-next-g a:hover,.qt-next-g a:focus{background:#E3EEFF;border-color:#2B6CB0;text-decoration:none} @media (max-width:600px){.qt-next-g{grid-template-columns:repeat(2,1fr)}}<\/style>\n<div class=\"qt-tool\" id=\"qt-rx\">\n<div class=\"qt-grid\">\n<div class=\"qt-field\" style=\"grid-column:1\/-1\"><label for=\"qt-rx-p\">Regular expression<\/label><input type=\"text\" id=\"qt-rx-p\" spellcheck=\"false\" class=\"qt-mono\" value=\"\\b\\w+@\\w+\\.\\w+\\b\"><\/div>\n<\/div>\n<div class=\"qt-row\"><label class=\"qt-check\"><input type=\"checkbox\" id=\"qt-rx-g\" checked> g (all matches)<\/label><label class=\"qt-check\"><input type=\"checkbox\" id=\"qt-rx-i\"> i (ignore case)<\/label><label class=\"qt-check\"><input type=\"checkbox\" id=\"qt-rx-m\"> m (multiline)<\/label><label class=\"qt-check\"><input type=\"checkbox\" id=\"qt-rx-s\"> s (dot matches new line)<\/label><label class=\"qt-check\"><input type=\"checkbox\" id=\"qt-rx-u\"> u (Unicode)<\/label><\/div>\n<div class=\"qt-row\"><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" data-qt-rx=\"[\\w.+-]+@[\\w-]+\\.[\\w.-]+\">Email<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" data-qt-rx=\"https?:\\\/\\\/[^\\s]+\">URL<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" data-qt-rx=\"\\(?\\d{3}\\)?[-.\\s]?\\d{3}[-.\\s]?\\d{4}\">US phone<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" data-qt-rx=\"\\d{4}-\\d{2}-\\d{2}\">Date (YYYY-MM-DD)<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" data-qt-rx=\"#(?:[0-9a-fA-F]{3}){1,2}\\b\">Hex color<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" data-qt-rx=\"\\b\\d+(?:\\.\\d+)?\\b\">Numbers<\/button><\/div>\n<div class=\"qt-field\"><label for=\"qt-rx-t\">Test text<\/label><textarea id=\"qt-rx-t\" rows=\"6\" spellcheck=\"false\"><\/textarea><\/div>\n<div class=\"qt-status\" id=\"qt-rx-status\" aria-live=\"polite\"><\/div>\n<div class=\"qt-mono\" id=\"qt-rx-hl\" style=\"white-space:pre-wrap;min-height:4em\"><\/div>\n<table class=\"qt-table\">\n<thead>\n<tr>\n<th>#<\/th>\n<th>Match<\/th>\n<th>Index<\/th>\n<th>Groups<\/th>\n<\/tr>\n<\/thead>\n<tbody id=\"qt-rx-out\"><\/tbody>\n<\/table>\n<div class=\"qt-grid\">\n<div class=\"qt-field\"><label for=\"qt-rx-r\">Replace with (optional, use $1 for groups)<\/label><input type=\"text\" id=\"qt-rx-r\" spellcheck=\"false\"><\/div>\n<\/div>\n<p><textarea id=\"qt-rx-res\" rows=\"4\" readonly spellcheck=\"false\" aria-label=\"Replace result\" style=\"display:none;width:100%\"><\/textarea><\/p>\n<p class=\"qt-note\">Everything runs in your browser. Nothing you enter is sent to or stored on our server.<\/p>\n<\/div>\n<p><script>(function () { function qtReady(fn) { if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', fn); } else { fn(); } } function qtCopy(text, statusEl, okMsg) { function done(ok) { if (statusEl) { statusEl.textContent = ok ? (okMsg || 'Copied to clipboard.') : 'Press Ctrl+C (or Cmd+C) to copy.'; } } function fallback() { var ta = document.createElement('textarea'); ta.value = text; ta.setAttribute('readonly', ''); ta.style.position = 'fixed'; ta.style.top = '-1000px'; document.body.appendChild(ta); ta.select(); var ok = false; try { ok = document.execCommand('copy'); } catch (e) { ok = false; } document.body.removeChild(ta); done(ok); } if (navigator.clipboard) { if (window.isSecureContext) { navigator.clipboard.writeText(text).then(function () { done(true); }, fallback); return; } } fallback(); } function qtRand32() { var c = window.crypto || window.msCrypto; if (c) { if (c.getRandomValues) { var a = new Uint32Array(1); c.getRandomValues(a); return a[0]; } } return Math.floor(Math.random() * 4294967296); } function qtRandInt(range) { if (range === 4294967296) { return qtRand32(); } var limit = Math.floor(4294967296 \/ range) * range; var x = qtRand32(); while (x >= limit) { x = qtRand32(); } return x % range; } qtReady(function () { var pEl = document.getElementById('qt-rx-p'); if (!pEl) { return; } function $(id) { return document.getElementById(id); } var tEl = $('qt-rx-t'); function upd() { var st = $('qt-rx-status'), hl = $('qt-rx-hl'), body = $('qt-rx-out'), txt = tEl.value; st.classList.remove('qt-error'); body.textContent = ''; hl.textContent = ''; var fl = ['g', 'i', 'm', 's', 'u'].filter(function (f) { return $('qt-rx-' + f).checked; }).join(''); if (!pEl.value) { st.textContent = 'Type a pattern.'; hl.textContent = txt; return; } var re; try { re = new RegExp(pEl.value, fl.indexOf('g') === -1 ? fl + 'g' : fl); } catch (e) { st.textContent = e.message; st.classList.add('qt-error'); hl.textContent = txt; return; } var ms = [], m, guard = 0; while ((m = re.exec(txt)) !== null) { ms.push(m); if (m[0] === '') { re.lastIndex++; } if (fl.indexOf('g') === -1) { break; } if (++guard >= 5000) { break; } } var pos = 0; ms.forEach(function (x, i) { if (x.index > pos) { hl.appendChild(document.createTextNode(txt.slice(pos, x.index))); } var mk = document.createElement('mark'); mk.textContent = x[0] || '\\u2009'; mk.title = 'Match ' + (i + 1); hl.appendChild(mk); pos = x.index + x[0].length; if (200 > i) { var tr = document.createElement('tr'); [String(i + 1), x[0], String(x.index), x.length > 1 ? x.slice(1).map(function (g, k) { return '$' + (k + 1) + ': ' + (g === undefined ? '(none)' : g); }).join(', ') : ''].forEach(function (v) { var td = document.createElement('td'); td.textContent = v; tr.appendChild(td); }); body.appendChild(tr); } }); if (txt.length > pos) { hl.appendChild(document.createTextNode(txt.slice(pos))); } st.textContent = ms.length ? ms.length + ' match' + (ms.length === 1 ? '' : 'es') + (guard >= 5000 ? ' (stopped at 5,000)' : '') + '. Pattern: \/' + pEl.value + '\/' + fl : 'No matches.'; var rv = $('qt-rx-r').value, res = $('qt-rx-res'); if (rv) { res.style.display = ''; try { res.value = txt.replace(new RegExp(pEl.value, fl), rv); } catch (e) { res.value = e.message; } } else { res.style.display = 'none'; } } ['qt-rx-p', 'qt-rx-t', 'qt-rx-r'].forEach(function (id) { $(id).addEventListener('input', upd); }); ['g', 'i', 'm', 's', 'u'].forEach(function (f) { $('qt-rx-' + f).addEventListener('change', upd); }); Array.prototype.forEach.call(document.querySelectorAll('[data-qt-rx]'), function (b) { b.addEventListener('click', function () { pEl.value = b.getAttribute('data-qt-rx'); upd(); }); }); tEl.value = 'Contact sales@example.com or help@site.org before 2026-12-31.\\nCall (555) 123-4567. Brand colors: #1A73E8 and #fff.\\nPrice: 49.99 for 3 seats at https:\/\/example.com\/pricing'; upd(); }); })();<\/script><\/p>\n<div class=\"qt-next\">\n<p class=\"qt-next-h\">Try another free tool<\/p>\n<div class=\"qt-next-g\"><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/uuid-generator\/\">UUID Generator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/base64-encode-decode\/\">Base64 Encode and Decode<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/unix-timestamp-converter\/\">Unix Timestamp Converter<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/json-formatter\/\">JSON Formatter<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/url-encode-decode\/\">URL Encode and Decode<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/password-generator\/\">Password Generator<\/a><\/div>\n<\/div>\n<p><strong>Quick answer:<\/strong> Type a pattern in the first box and your text in the second. Every match is highlighted, and the table lists each match, where it starts and what each capture group caught. The tool uses JavaScript&#8217;s regex engine, the same one used in browsers and Node.js.<\/p>\n<h2>How to use the regex tester<\/h2>\n<ol>\n<li>Enter a regular expression without the surrounding slashes, for example <code>d{3}-d{4}<\/code>.<\/li>\n<li>Tick the flags you need: <strong>g<\/strong> for all matches, <strong>i<\/strong> to ignore case, <strong>m<\/strong> so ^ and $ match at each line, <strong>s<\/strong> so a dot also matches line breaks, and <strong>u<\/strong> for full Unicode.<\/li>\n<li>Paste the text to test. Matches are highlighted live.<\/li>\n<li>Optionally type a replacement to preview the result of <code>text.replace()<\/code>, using $1, $2 for capture groups.<\/li>\n<\/ol>\n<h2>Regex cheat sheet<\/h2>\n<table class=\"qt-ref\">\n<thead>\n<tr>\n<th>Pattern<\/th>\n<th>Matches<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>.<\/code><\/td>\n<td>Any character except a line break<\/td>\n<\/tr>\n<tr>\n<td><code>\\d \\w \\s<\/code><\/td>\n<td>A digit, a word character (letter, digit, underscore), whitespace<\/td>\n<\/tr>\n<tr>\n<td><code>\\D \\W \\S<\/code><\/td>\n<td>The opposite of each of the above<\/td>\n<\/tr>\n<tr>\n<td><code>[abc] [^abc] [a-z]<\/code><\/td>\n<td>One of a, b or c; anything except them; a lowercase letter<\/td>\n<\/tr>\n<tr>\n<td><code>^ $<\/code><\/td>\n<td>Start and end of the text, or of each line with the m flag<\/td>\n<\/tr>\n<tr>\n<td><code>\\b<\/code><\/td>\n<td>A word boundary<\/td>\n<\/tr>\n<tr>\n<td><code>* + ?<\/code><\/td>\n<td>0 or more, 1 or more, 0 or 1 of the previous item<\/td>\n<\/tr>\n<tr>\n<td><code>{3} {2,5}<\/code><\/td>\n<td>Exactly 3, or between 2 and 5<\/td>\n<\/tr>\n<tr>\n<td><code>*? +?<\/code><\/td>\n<td>Lazy versions that match as little as possible<\/td>\n<\/tr>\n<tr>\n<td><code>(abc) (?:abc)<\/code><\/td>\n<td>Capturing group; non-capturing group<\/td>\n<\/tr>\n<tr>\n<td><code>(?&lt;name&gt;abc)<\/code><\/td>\n<td>Named group<\/td>\n<\/tr>\n<tr>\n<td><code>a|b<\/code><\/td>\n<td>a or b<\/td>\n<\/tr>\n<tr>\n<td><code>(?=x) (?!x)<\/code><\/td>\n<td>Followed by x; not followed by x<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Common mistakes<\/h2>\n<ul>\n<li><strong>Forgetting to escape:<\/strong> characters like <code>. * + ? ( ) [ ] { } | ^ $ \\<\/code> have special meanings. Write <code>\\.<\/code> to match a real dot.<\/li>\n<li><strong>Greedy matching:<\/strong> <code>&lt;.*&gt;<\/code> matches from the first &lt; to the last &gt; on the line. Use <code>&lt;.*?&gt;<\/code> to stop at the first.<\/li>\n<li><strong>Double escaping in code:<\/strong> inside a JavaScript or Java string, a backslash must be written twice, so <code>\\d<\/code> becomes <code>\"\\\\d\"<\/code>.<\/li>\n<\/ul>\n<p>Other engines such as PCRE (PHP), Python and Java support nearly the same syntax, with small differences in lookbehind and named groups. To change text in bulk with a pattern, use <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/find-and-replace\/\">find and replace<\/a>. Format API responses with the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/json-formatter\/\">JSON formatter<\/a>.<\/p>\n<h2>FAQ<\/h2>\n<h3>Why does my pattern match nothing?<\/h3>\n<p>Check the error message under the pattern box, make sure special characters are escaped, and try the i flag in case the letter case differs.<\/p>\n<h3>Is my text uploaded?<\/h3>\n<p>No. Matching runs entirely in your browser.<\/p>\n<h2>More free tools<\/h2>\n<div class=\"qt-cards\"><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/uuid-generator\/\"><strong>UUID Generator<\/strong><span>Generate random v4 UUIDs and GUIDs in bulk.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/base64-encode-decode\/\"><strong>Base64 Encode and Decode<\/strong><span>Encode text to Base64 and decode it back, UTF-8 safe.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/unix-timestamp-converter\/\"><strong>Unix Timestamp Converter<\/strong><span>Convert epoch time to a date and a date to epoch.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/json-formatter\/\"><strong>JSON Formatter<\/strong><span>Beautify, minify and validate JSON with error lines.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/url-encode-decode\/\"><strong>URL Encode and Decode<\/strong><span>Percent-encode or decode URLs and see query parameters.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/password-generator\/\"><strong>Password Generator<\/strong><span>Strong random passwords and passphrases with a strength meter.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/html-entities\/\"><strong>HTML Encode and Decode<\/strong><span>Convert special characters to HTML entities and back.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/hash-generator\/\"><strong>Hash Generator<\/strong><span>MD5, SHA-1 and SHA-256 hashes of any text.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/css-minifier\/\"><strong>CSS Minifier<\/strong><span>Minify or beautify CSS and see the savings.<\/span><\/a><\/div>\n<p>See all of them on the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/\">QuickOnlineTips free online tools<\/a> page and play our <a href=\"https:\/\/www.quickonlinetips.com\/archives\/games\/\">free online games<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This regex tester checks a regular expression against your text and highlights every match as you type. See match positions and capture groups in a table, switch flags on and off, start from common patterns for emails, URLs and dates, and preview a replace before you put the pattern in your code. Regular expression g&#8230;<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":65595,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-65899","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65899","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/comments?post=65899"}],"version-history":[{"count":3,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65899\/revisions"}],"predecessor-version":[{"id":66434,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65899\/revisions\/66434"}],"up":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65595"}],"wp:attachment":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/media?parent=65899"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}