Testeur Regex
Regular expressions are one of the most powerful — and most confusing — tools in a developer's arsenal. Our regex tester gives you a real-time match highlighter, named capture group extractor, explanation of each part of your pattern in plain English, and a reference cheat sheet. Supports JavaScript (default), PCRE, and Python regex flavors.
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À propos de Regex Tester
Regular expressions are one of the most powerful — and most confusing — tools in a developer's arsenal. Our regex tester gives you a real-time match highlighter, named capture group extractor, explanation of each part of your pattern in plain English, and a reference cheat sheet. Supports JavaScript (default), PCRE, and Python regex flavors.
Comment l'utiliser
- Enter your regex pattern in the pattern field.
- Set flags: g (global), i (case-insensitive), m (multiline), s (dotAll).
- Paste test text — all matches highlight live.
- View named capture groups, full match, and groups in a structured table.
- Click "Explain" to get a plain-English breakdown of each regex token.
Formule et méthodologie
Common tokens: . (any char), \d (digit), \w (word char), \s (whitespace), ^ (line start), $ (line end), * (0+), + (1+), ? (0 or 1), {n,m} (n to m). Groups: () capture, (?:) non-capture, (?<name>) named. Lookahead: (?=), (?!). Lookbehind: (?<=), (?<!). Alternation: |.
Cas d'usage courants
- Form validation: email, phone number, ZIP code patterns
- Log parsing: extracting timestamps, error codes, IP addresses
- Find-and-replace in code editors: refactoring variable names
- URL routing: matching path patterns in web frameworks
- Data cleaning: removing or normalizing inconsistent text formats
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