Common Presets:
/
/
Syntax Error:
Invalid regular expression
ReDoS Risk:
Safe (Linear Complexity)
Matches:
0
Capture Groups:
0
Exec Time:
0.00 ms
(sandbox)
Potential Catastrophic Backtracking Detected
This pattern contains nested quantifiers or overlapping alternations that can induce exponential branch evaluation.
Tip: Simplify repetitions or anchor delimiters.
Test String
(0 characters)
|
Match (Odd)
Match (Even)
Zero-width assertion
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String Substitution / Replace
Resulting Output Preview:
0 substitutions made
No substitution text or matches yet.
Match Extractions & Capture Groups
Interactive Regular Expressions Cheat Sheet
Click any token or pattern to insert it directly into your active expression.