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🧩 Regex Tester & Generator
Quick Tips for Using Regex
- . - Matches any single character except newline.
- ^ - Matches the beginning of a string.
- $ - Matches the end of a string.
- \d - Matches any digit (0-9).
- \w - Matches any word character (alphanumeric + underscore).
- \s - Matches any whitespace character.
- * - Matches 0 or more of the preceding character.
- + - Matches 1 or more of the preceding character.
- ? - Matches 0 or 1 of the preceding character (optional).
- [abc] - Matches any one of the characters a, b, or c.
- (abc) - Groups characters as a single unit.
Common Flags Explained:
- g - Global search (find all matches, not just the first).
- i - Case-insensitive search.
- m - Multiline mode (anchors ^ and $ match line starts/ends).
- s - Allows dot (.) to match newline characters.
- u - Enables full Unicode matching.
- y - Sticky mode (matches only from the last index position).
Example Patterns
- Email Validation:
Pattern: ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$
Example Match: user@example.com
- Phone Number (US Format):
Pattern: \(\d{3}\) \d{3}-\d{4}
Example Match: (123) 456-7890
- Date (YYYY-MM-DD):
Pattern: \d{4}-\d{2}-\d{2}
Example Match: 2024-02-22
- URL Detection:
Pattern: https?:\/\/[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}(?:\/[^\s]*)?
Example Match: https://example.com
- Find Words Starting with Capital Letters:
Pattern: \b[A-Z][a-z]*\b
Example Match: Regex in "This is a Regex Example"
Generator Examples
- Email Example:
Input: user@example.com
Generated Regex: ^[\w.%+-]+@[\w.-]+\.[a-zA-Z]{2,}$
- Phone Number Example:
Input: (123) 456-7890
Generated Regex: \(\d{3}\) \d{3}-\d{4}
- Date Example:
Input: 2024-02-22
Generated Regex: \d{4}-\d{2}-\d{2}
- URL Example:
Input: https://example.com
Generated Regex: https?:\/\/[\w.-]+\.[a-zA-Z]{2,}(?:\/[^\s]*)?
- Exact Match Example:
Input: Hello (world)!
Generated Regex: Hello \(world\)!
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