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Test and debug regular expressions in real time with our free online regex tester. Enter a pattern and a test string, and matches highlight instantly — no button clicks needed. View all capture groups and their positions at a glance. All processing runs entirely in your browser using JavaScript — your data never leaves your device.
\d{3}-\d{4} for phone numbers)^ and $ match start and end of each line. matches newline characters too[\w.-]+@[\w.-]+\.\w{2,}\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}https?:\/\/[\w.-]+(?:\/[\w./-]*)?\d{4}-\d{2}-\d{2}\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}#(?:[0-9a-fA-F]{3}){1,2}. — Any character except newline\d — Any digit (0–9)\w — Any word character (a–z, A–Z, 0–9, _)\s — Any whitespace[abc] — Any of a, b, or c[^abc] — Not a, b, or ca{3} — Exactly 3 a'sa{2,5} — Between 2 and 5 a'sa* — Zero or more a'sa+ — One or more a'sa? — Zero or one a(group) — Capture group(?:group) — Non-capturing group^ — Start of string (or line with m flag)$ — End of string (or line with m flag)., *, +, ?, (), [], {}, \, |, ^, $ are all special. Use \. to match a literal dot. Also make sure you have the global (g) flag enabled to find all matches.(...). For example, in the pattern (\w+)@(\w+) matched against alice@example: the full match is alice@example, group 1 is alice, and group 2 is example. Groups are displayed with their index and content.(?<=...)) were added to JavaScript only in ES2018 and may not be supported in older environments or other languages' implementations.