How to Use

1. Enter pattern – Type your regex pattern in the Pattern field
2. Select flags – Choose any flags you need (global, case-insensitive, etc.)
3. Add test text – Paste the text you want to test against
4. See matches – Matches are highlighted and details shown below

Common Regex Patterns

• ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$ – Email address
• https?://[^\s]+ – URL
• \b\d{3}-\d{3}-\d{4}\b – Phone number (XXX-XXX-XXXX)
• ^\d{4}-\d{2}-\d{2}$ – Date (YYYY-MM-DD)
• \b[A-Z][a-z]+\b – Capitalized words
• \d+ – One or more digits
• [a-z]+ – One or more lowercase letters

Example

Pattern: \b(\w+)@([\w.]+)\b (with global flag)

Test Text: contact alice@example.com or bob@company.co.uk here

Matches:

• Match 1: alice@example.com → Group 1: alice, Group 2: example.com
• Match 2: bob@company.co.uk → Group 1: bob, Group 2: company.co.uk

Regex Syntax Basics

• . – Any character except newline
• \d – Digit (0-9)
• \w – Word character (a-z, A-Z, 0-9, _)
• \s – Whitespace (space, tab, newline)
• ^ – Start of string (or line in multiline mode)
• $ – End of string (or line in multiline mode)
• * – Zero or more, + – One or more, ? – Zero or one
• [abc] – Match any of a, b, or c
• () – Capture group

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