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Regex Parser

Generate regex patterns to match string variations for security testing and pattern matching

Input String

Enter your string

Enter a word or phrase to generate regex patterns for its variations

Case insensitive

Leet speak (1337)

Allow whitespace

Special char inserts

Double characters

Unicode lookalikes

Word boundaries

Match whole string

Match numeric variations (GUID/SSN/CC)

Enter a string above and click "Generate Regex"

These are examples of strings that the generated regex will match:

Generate a regex to see variations

Enter test strings (one per line)

This tool generates regular expressions that match variations of an input string. It's useful for:

Security Testing: Detect obfuscated keywords in payloads (e.g., "script" → "scr1pt", "SCR!PT")
Input Validation: Create filters that catch evasion attempts
Pattern Matching: Find variations of terms in logs or data
WAF Rules: Build more robust web application firewall signatures

Case insensitive: Matches both uppercase and lowercase (admin, ADMIN, Admin)
Leet speak: Includes common character substitutions (a→4, e→3, i→1, o→0, s→5, t→7)
Allow whitespace: Permits optional spaces/tabs between characters
Special char inserts: Allows special characters between letters (a.d.m.i.n)
Double characters: Matches repeated characters (aadminn, passsword)
Unicode lookalikes: Includes similar-looking Unicode characters (а→a cyrillic)
Word boundaries: Only match complete words, not substrings
Match whole string: Pattern must match entire input (uses ^ and $)
Match numeric variations: Detects GUIDs, SSNs, and credit card formats based on your sample