Regex Tester

A regular expression (or "regex") is a sequence of characters that defines a search pattern. It's used for pattern matching, text validation, data extraction, and search-and-replace operations. Common use cases include validating email addresses, extracting phone numbers, or finding all URLs in a document.

Here are simple patterns to help beginners get started with our regex tester:

• \d+ — Match digits (like numbers). Example: "Order 345" matches "345".
• [A-Za-z]+ — Match letters only. Example: "abc123" matches "abc".
• \s — Match whitespace characters (spaces, tabs, newlines).
• ^ and $ — Match the start and end of a line or string.
• (.*) — A capturing group that matches any characters.
• \w+@\w+\.\w+ — Simple email pattern, like "user@site.com".

Enter a regex pattern in the first input (without delimiters like /.../). Select the flags you need using the checkboxes. Type or paste a test string in the text area. Matches are highlighted in the results panel in real time, with each match listed separately below.

Flags control how the pattern is applied:

• g (global) — Find all matches, not just the first one. This is the most commonly used flag.
• i (case-insensitive) — Ignore case differences. Match "HELLO" against "hello".
• m (multiline) — Treat each line separately: ^ and $ match line boundaries, not just string boundaries.
• s (dot-all) — Make the dot (.) match newline characters too.
• u (unicode) — Enable full Unicode pattern matching for emojis and international characters.
• y (sticky) — Match only from the last match index onward.