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.
\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.