[{"content":{"header":"[Tejji.com](/)\n\n[Contact](/contact) [Sign in](/account/signin)\n\nInstall\n\nMenu\n\nApps \u0026 Tools\n\n[Mortgage Calculator](/apps/mortgage-calculator) [Loan EMI Calculator](/apps/loan-emi-calculator) [Compound Interest Calculator](/apps/compound-interest-calculator) [Investment Calculator](/apps/investment-calculator) [Retirement Calculator](/apps/retirement-calculator) [Future Value Calculator](/apps/future-value-calculator) [Net Present Value Calculator](/apps/net-present-value-calculator) [Inflation Calculator](/apps/inflation-calculator) [Salary Calculator](/apps/salary-calculator) [Income Tax Calculator](/apps/tax-calculator) [Sales Tax Calculator](/apps/sales-tax-calculator) [Tip Calculator](/apps/tip-calculator) [Percentage Calculator](/apps/percentage-calculator) [APR to APY](/apps/apr-to-apy) [Money Converter](/apps/money-converter) [Send Money](/apps/send-money) [Invoice Generator](/apps/invoice-generator) [Calculator](/apps/calculator) [BMI Calculator](/apps/bmi-calculator) [Body Fat Calculator](/apps/body-fat-calculator) [Calorie Calculator](/apps/calorie-calculator) [GPA Calculator](/apps/gpa-calculator) [Grade Calculator](/apps/grade-calculator) [JSON Formatter](/apps/json-formatter) [Regex Tester](/apps/regex-tester) [Hash Generator](/apps/hash-generator) [UUID Generator](/apps/uuid-generator) [Unix Timestamp Converter](/apps/timestamp-converter) [Cron Builder](/apps/cron-expression-builder) [Base64 Encoder](/apps/encode-decode-base64) [HTML Encoder](/apps/encode-decode-html) [HTML to Text](/apps/html-to-text) [URL Encoder Decoder](/apps/url-encoder-decoder) [Markdown Editor](/apps/markdown-editor) [Meta Tag Generator](/apps/meta-tag-generator) [QR Code Generator](/apps/qr-code-generator) [Password Generator](/apps/password-generator) [Color Picker](/apps/color-picker) [Character Count](/apps/character-count) [Typo Generator](/apps/typo-generator) [Age Calculator](/apps/age-calculator) [Date Calculator](/apps/date-calculator) [What Day Is It](/apps/what-day-is-it) [Lottery Number Generator](/apps/lottery-number-generator) [Pomodoro Timer](/apps/pomodoro-timer) [Pythagoras Theorem](/apps/pythagoras-theorem) [Roman Numeral Converter](/apps/roman-numeral-converter)\n\ntraffic-rank\n\n[Traffic Rank](/traffic-rank) [Top 1M](/traffic-rank/top-1m-sites) [Top Climbers](/traffic-rank/top-climbers) [Compare](/traffic-rank/compare) [Widget](/traffic-rank/widget) [Category](/traffic-rank/category) [Country](/traffic-rank/country) [Alexa Alt.](/traffic-rank/alexa-replacement)\n\nUnit Converters\n\n[Temperature](/convert/temperature-conversion) [Length](/convert/length-conversion) [Length (Metric)](/convert/length-metric-conversion) [Metric](/convert/metric-conversion) [Bytes](/convert/bytes-conversion) [Bytes Widgets](/convert/bytes-conversion/widgets) [Number](/convert/number-conversion) [Angle](/convert/angle-conversion) [Astronomical](/convert/astronomical-conversion) [Frequency](/convert/frequency-conversion) [Mileage](/convert/mileage-conversion) [Mass / Weight](/convert/mass-conversion) [Mass (Metric)](/convert/mass-metric-conversion) [Speed](/convert/speed-conversion)\n\nIP Address Tools\n\n[My IP Address](/ip/my-ip-address) [IP Location](/ip/ip-to-location) [Bulk IP Lookup](/ip/bulk-ip-lookup) [IP to URL](/ip/ip-address-to-url) [URL to IP](/ip/url-to-ip-address) [IP to Number](/ip/ip-to-number) [IPv4 to IPv6 Converter](/ip/ipv4-to-ipv6-conversion) [IP Server Variables](/ip/ip-server-variables) [DNS Lookup](/ip/dns-lookup) [WHOIS Lookup](/ip/whois-lookup) [IP Blacklist Check](/ip/ip-blacklist-check) [Subnet Calculator](/ip/subnet-calculator) [IP Search](/ip/search) [IP Widgets](/ip/widgets) [JS Embed](/ip/widgets/js-embed) [iFrame](/ip/widgets/iframe) [SVG Badge](/ip/widgets/svg-badge) [WordPress](/ip/widgets/wordpress) [Dashboard](/ip/widgets/dashboard)\n\nTime \u0026 Date\n\n[World Clock](/time-date/world-clock) [Current Time](/time-date/current-time) [Time Conversion](/time-date/time-conversion) [Date Calculator](/apps/date-calculator) [Age Calculator](/apps/age-calculator) [What Day Is It](/apps/what-day-is-it) [Unix Timestamp Converter](/apps/timestamp-converter) [Cron Builder](/apps/cron-expression-builder) [Pomodoro Timer](/apps/pomodoro-timer)\n\nVisa \u0026 Immigration\n\n[H1B Data](/visa/h1b) [H1B Sponsors](/visa/h1b-sponsors) [H1B Salary](/visa/h1b-salary) [H1B Trends](/visa/h1b-trends) [H1B Compare](/visa/h1b-compare)\n\nPostal / ZIP Codes\n\n[ZIP Code Lookup](/zip-codes) [India PIN Finder](/zip-codes/pincode-finder) [US ZIP Codes](/zip-codes/us) [India PIN Codes](/zip-codes/india)\n\nMore\n\n[Chrome Extensions](/browser/chrome/extensions/) [Keyword Tool](/seo/keyword-tool) [Contact](/contact)\n\n[Sign in with Google](/account/signin)\n\n","main":"- Finance\n- [Mortgage Calculator](/apps/mortgage-calculator)\n- [Loan EMI Calculator](/apps/loan-emi-calculator)\n- [Compound Interest Calculator](/apps/compound-interest-calculator)\n- [Investment Calculator](/apps/investment-calculator)\n- [Retirement Calculator](/apps/retirement-calculator)\n- [Future Value Calculator](/apps/future-value-calculator)\n- [Net Present Value Calculator](/apps/net-present-value-calculator)\n- [Inflation Calculator](/apps/inflation-calculator)\n- [Salary Calculator](/apps/salary-calculator)\n- [Income Tax Calculator](/apps/tax-calculator)\n- [Sales Tax Calculator](/apps/sales-tax-calculator)\n- [Tip Calculator](/apps/tip-calculator)\n- [Percentage Calculator](/apps/percentage-calculator)\n- [APR to APY](/apps/apr-to-apy)\n- [Money Converter](/apps/money-converter)\n- [Send Money](/apps/send-money)\n- [Invoice Generator](/apps/invoice-generator)\n- [Calculator](/apps/calculator)\n\n\u003c!--THE END--\u003e\n\n- Health\n- [BMI Calculator](/apps/bmi-calculator)\n- [Body Fat Calculator](/apps/body-fat-calculator)\n- [Calorie Calculator](/apps/calorie-calculator)\n\n\u003c!--THE END--\u003e\n\n- Education\n- [GPA Calculator](/apps/gpa-calculator)\n- [Grade Calculator](/apps/grade-calculator)\n\n\u003c!--THE END--\u003e\n\n- Developer\n- [JSON Formatter](/apps/json-formatter)\n- [Regex Tester](/apps/regex-tester)\n- [Hash Generator](/apps/hash-generator)\n- [UUID Generator](/apps/uuid-generator)\n- [Unix Timestamp Converter](/apps/timestamp-converter)\n- [Cron Builder](/apps/cron-expression-builder)\n- [Base64 Encoder](/apps/encode-decode-base64)\n- [HTML Encoder](/apps/encode-decode-html)\n- [HTML to Text](/apps/html-to-text)\n- [URL Encoder Decoder](/apps/url-encoder-decoder)\n- [Markdown Editor](/apps/markdown-editor)\n- [Meta Tag Generator](/apps/meta-tag-generator)\n- [QR Code Generator](/apps/qr-code-generator)\n- [Password Generator](/apps/password-generator)\n- [Color Picker](/apps/color-picker)\n- [Character Count](/apps/character-count)\n- [Typo Generator](/apps/typo-generator)\n\n\u003c!--THE END--\u003e\n\n- Fun\n- [Age Calculator](/apps/age-calculator)\n- [Date Calculator](/apps/date-calculator)\n- [What Day Is It](/apps/what-day-is-it)\n- [Lottery Number Generator](/apps/lottery-number-generator)\n\n\u003c!--THE END--\u003e\n\n- Productivity\n- [Pomodoro Timer](/apps/pomodoro-timer)\n\n\u003c!--THE END--\u003e\n\n- Math\n- [Pythagoras Theorem](/apps/pythagoras-theorem)\n- [Roman Numeral Converter](/apps/roman-numeral-converter)\n\nRegex Tester\n\n# Regex Tester — Regular Expression Tester\n\nTest and debug regular expressions with real-time pattern matching and capture group highlighting. Invaluable for developers, data engineers, and anyone working with text patterns. Supports JavaScript regex with instant visual feedback.\n\nRegular Expression\n\n/ /\n\nFlags: g i m s\n\nTest String\n\nMatches\n\nMatch Details\n\nEnter a pattern and test string to see matches\n\n## Find \u0026 Replace\n\nReplacement String\n\nReplaced Output\n\n## Common Patterns\n\n## Related Products\n\n[📘 Regex Books →](https://www.amazon.com/s?k=mastering%20regular%20expressions%20book\u0026tag=tejji-20) [📚 Programming Reference →](https://www.amazon.com/s?k=programming%20reference%20guide\u0026tag=tejji-20) [⌨️ Mechanical Keyboards →](https://www.amazon.com/s?k=mechanical%20keyboard%20coding\u0026tag=tejji-20)\n\n*As an Amazon Associate, tejji.com earns from qualifying purchases.*\n\n## Frequently Asked Questions\n\n### How do I test a regular expression?\n\nEnter your regex pattern in the pattern field, add flags (g, i, m) as needed, and type your test string below. Matches are highlighted instantly in real-time.\n\n### What are regex flags?\n\nCommon flags: g (global - find all matches), i (case-insensitive), m (multiline - ^ and $ match line boundaries), s (dotAll - dot matches newlines).\n\n### Can I use this for search and replace?\n\nYes! Enter a replacement string and the tool shows the result of replacing all matches. You can use capture groups ($1, $2) in the replacement.\n\n### What is the best free regex tester?\n\nThis Regex Tester is one of the best free regex testers available online. It runs entirely in your browser with no data sent to any server. It provides real-time match highlighting, capture group details, and find-and-replace functionality.\n\n### Is this regex tester accurate and safe?\n\nYes. The tool uses your browser's built-in JavaScript regex engine for accurate pattern matching. No data is ever sent to a server, so your patterns and test strings stay completely private on your device.\n\n## Related Tools\n\n[{ } JSON Formatter developer](/apps/json-formatter) [# Hash Generator developer](/apps/hash-generator) [⚿ UUID Generator developer](/apps/uuid-generator) [⏱ Timestamp Converter developer](/apps/timestamp-converter) [🎨 Color Picker developer](/apps/color-picker)\n\n📱\n\nQuick Access\n\nInstall this tool on your device for instant access\n\nInstall App","footer":"\n\n📱 Install Tejji for quick access to this tool Install\n\nTools\n\n- [All Apps](/apps/)\n- [Converters](/convert/)\n- [IP Tools](/ip/)\n- [Calculator](/apps/calculator)\n\nExplore\n\n- [Time \u0026 Date](/time-date/)\n- [Postal Codes](/zip-codes/)\n- [Typing](/typing/)\n- [Extensions](/browser/chrome/extensions/)\n\nCompany\n\n- [About](/home/about)\n- [Contact](/home/contact)\n- [Privacy](/home/privacy)\n- [Terms](/home/terms)\n\nSupport\n\n- [Feedback](/home/contact)\n- [Buy me a coffee](https://buymeacoffee.com/tejji)\n\n© 2026 [Tejji.com](/) — Free online tools for everyone.\n\nWe use cookies for analytics and ads. By clicking \"Accept\", you consent to our use of cookies. [Privacy Policy](/home/privacy)\n\nReject Accept"},"metadata":{"title":"Regex Tester | Free Online Tool | Tejji","description":"Free online regex tester — build, test, and debug regular expressions with real-time matching and highlighting. Supports all major regex flavors. No sign-up required.","imageUrl":"https://tejji.com/page/og-default.png","author":null,"published":null,"modified":null},"rate":{"price":{"priceMicros":0,"currency":""},"license":{"cuid":"","licenseType":"","licensePath":"","permissions":[],"validUntil":""},"error":""}}]