RDX
ReDoS Tester
catastrophic backtracking · evil input · timing analysis
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Paste a regex above
Static analysis will run automatically
Evil Inputs
Timing Test
⚠ May slow browser on vulnerable patterns
Max input length
▶ Run Timing Test
Input length
Evil input
Time (ms)
Status
Example Patterns
(a+)+
(a|aa)+
(a*)*
[a-zA-Z]+)*
(a+b?)+c
(\\w+\\s?)*
[a-z]+[0-9]+)*
(a+|b+)*c
(.*a){10}
(\\w+\\b\\s*)+$
email (safe)
IPv4 (safe)
URL (safe)