Comments (3)
As intended.
There is no payload which will cause backtracking with this regex unless you are using it with a function like python's re.fullmatch
. A slight trade-off to avoid false positives.
/(a+)+/.test('ay') // js matches, no ReDoS possible
re.compile(r"(a+)+").match("ay") # python matches, no ReDoS possible
It does find ReDoS when it is possible to cause backtracking:
Welcome to Regexploit. Enter your regexes:
(a+)+$
Pattern: (a+)+$
---
Redos(starriness=11, prefix_sequence=SEQ{ }, redos_sequence=SEQ{ [a]{1+}{1+} $[a] }, repeated_character=[a], killer=[^a])
Worst-case complexity: 11 ⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐ (exponential)
Repeated character: [a]
Final character to cause backtracking: [^a]
Example: 'a' * 3456 + '0'
(a+)+x
Pattern: (a+)+x
---
Redos(starriness=11, prefix_sequence=SEQ{ }, redos_sequence=SEQ{ [a]{1+}{1+} [x] }, repeated_character=[a], killer=None)
Worst-case complexity: 11 ⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐ (exponential)
Repeated character: [a]
Example: 'a' * 3456
(a+)+\w
Pattern: (a+)+\w
---
Redos(starriness=11, prefix_sequence=SEQ{ }, redos_sequence=SEQ{ [a]{1+}{1+} [WORD] }, repeated_character=[a], killer=[^WORD])
Worst-case complexity: 11 ⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐ (exponential)
Repeated character: [a]
Final character to cause backtracking: [^WORD]
Example: 'a' * 3456 + '!'
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Same doubt.
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Related Issues (14)
- Feature Request: VS Code extension
- Slow run
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- Can't parse atomic groups HOT 3
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