Free online regular expression tools to build, test, and debug regex patterns. Live matching, syntax highlighting, and cheat sheets for all major flavors.
19 tools available
Regex Tester
Free online regex tester — test regular expressions with live match highlighting and position tracking instantly in your browser. No data is stored. Shows match positions and visual highlighting of matched text.
Regex Explainer
Free online regex explainer — break down any regular expression into plain English descriptions instantly in your browser. No data is stored. Explains character classes, quantifiers, groups, anchors, and lookaheads.
Regex Replace
Free online regex find and replace — search text with regular expressions and replace matches with custom patterns instantly in your browser. No data is stored. Supports capture group references ($1, $2) in replacement strings.
Regex Split
Free online regex text splitter — split text into parts using regular expression delimiters instantly in your browser. No data is stored. Supports custom flags and configurable result limits.
Regex Extract
Free online regex match extractor — find and extract all pattern matches from text instantly in your browser. No data is stored. Supports global, case-insensitive, and unique-only matching.
Regex Groups
Free online regex group extractor — extract named and numbered capture groups from regex matches instantly in your browser. No data is stored. Shows all groups for each match with clear formatting.
Regex Flags Tester
Free online regex flags tester — compare how different regex flags (g, i, m, s, u, y) affect pattern matching instantly in your browser. No data is stored. Shows match counts side-by-side for each flag combination.
Regex Escape
Free online regex escape tool — escape special regex characters in strings for safe literal matching instantly in your browser. No data is stored. Escapes dots, brackets, parentheses, and all regex metacharacters.
Glob to Regex
Free online glob to regex converter — convert glob wildcard patterns to equivalent regular expressions instantly in your browser. No data is stored. Supports extended globs, brace expansion, and character classes.
Regex to Glob
Free online regex to glob converter — convert simple regular expression patterns to glob wildcard equivalents instantly in your browser. No data is stored. Provides conversion notes when patterns can't be exactly represented.
Regex Optimizer
Free online regex optimizer — suggest shorter, more readable regular expression alternatives instantly in your browser. No data is stored. Simplifies character classes, quantifiers, and common patterns.
Common Regex Patterns
Free online regex pattern library — browse common regular expression patterns for email, URL, IP, phone, date, UUID, and more instantly in your browser. No data is stored. Ready-to-use patterns with descriptions and test examples.
Email Regex
Free online email regex generator — create email validation patterns at basic, standard, and strict levels instantly in your browser. No data is stored. Configurable strictness from simple format checks to RFC-compliant patterns.
URL Regex
Free online URL regex generator — create URL matching patterns for HTTP, HTTPS, FTP, and custom protocols instantly in your browser. No data is stored. Supports path, query string, and fragment matching.
Phone Regex
Free online phone number regex generator — create validation patterns for US, UK, international, and E.164 formats instantly in your browser. No data is stored. Includes matching examples for each format.
IP Address Regex
Free online IP address regex generator — create validation patterns for IPv4, IPv6, and CIDR notation instantly in your browser. No data is stored. Supports strict octet validation and subnet mask patterns.
Date Regex
Free online date regex generator — create date validation patterns for ISO 8601, US, EU, UK, and datetime formats instantly in your browser. No data is stored. Includes matching examples for each format.
Credit Card Regex
Free online credit card regex generator — create validation patterns for Visa, Mastercard, Amex, Discover, Diners, and JCB cards instantly in your browser. No data is stored. Format-only validation with configurable card types.
Password Regex
Free online password regex generator — create customizable password validation patterns with uppercase, lowercase, digit, and special character requirements instantly in your browser. No data is stored. Configurable minimum and maximum length.