Translate any regular expression into plain English with a color-coded breakdown of every token. This free regex to plain English translator parses capture groups, quantifiers, character classes, lookahead and lookbehind assertions, anchors, alternation, and more. Paste a regex pattern to instantly visualize its structure — a powerful regular expression breakdown tool for understanding complex pattern matching. All processing runs client-side in your browser.
Inherit a 200-character regex from a previous developer? Paste it here and the explainer translates it to plain English with color-coded breakdowns of every group, quantifier, character class, lookaround, and anchor. Useful for code review, learning, and figuring out why your pattern doesn't match what you thought.
(?i)) and you can toggle them via the flag buttons..* matching too much. By default .* grabs as much as possible. Use .*? (lazy) for shortest match — e.g. inside HTML tags.. matches any character. Use \. for a literal period.m flag. ^/$ match start/end of string, not line, unless you set multiline mode.(a+)+ on long input can hang for seconds. Use atomic groups, possessive quantifiers, or rewrite to be linear.re, Ruby Regexp. Lookbehinds, named groups, and Unicode escapes vary. Test in the dialect you'll deploy..+@.+\..+) and verify deliverability separately.\d, \w, and \s match character classes (digits, word characters, whitespace). Quantifiers like *, +, and ? control how many times the preceding token repeats. Anchors like ^ and $ mark the start and end of the string. Parentheses () create capturing groups, and square brackets [] define character sets. Use this regex explainer tool to instantly translate any pattern into plain English.\d matches any digit (0–9), equivalent to [0-9]. \w matches any word character (letters, digits, underscore), equivalent to [a-zA-Z0-9_]. \s matches whitespace (space, tab, newline). Their uppercase counterparts \D, \W, \S match the opposite — non-digit, non-word character, and non-whitespace respectively. The dot . matches any character except newline (unless the s flag is set).* means "zero or more" — the preceding element may appear any number of times or not at all. The plus + means "one or more" — the preceding element must appear at least once. For example, \d* matches an empty string or any sequence of digits, while \d+ requires at least one digit. Add ? after either (*?, +?) to make them lazy, matching as few characters as possible instead of as many.(). They group parts of a pattern together (to apply quantifiers or alternation) and capture the matched text for backreferences (\1, \2) or replacement strings ($1, $2). Non-capturing groups (?:...) group without saving the match, which is more efficient. Named groups (?<name>...) allow referencing by name instead of number. Groups are numbered left to right by their opening parenthesis.(?=...) is a positive lookahead: it asserts that what follows matches the pattern. (?!...) is a negative lookahead: asserts what follows does NOT match. (?<=...) is a positive lookbehind: checks what precedes. (?<!...) is a negative lookbehind: asserts the preceding text does NOT match. They are essential for complex pattern matching like password validation or extracting text between delimiters.