python runtime_error ai_generated true

AssertionError: Regex pattern '\d+' does not match 'abc'. assert regex_search('\d+', 'abc')

ID: python/pytest-assert-regex-mismatch

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2025-03-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —
3.10 active — — —
3.11 active — — —
3.12 active — — —

Root Cause

A test using pytest's `re.match` or `assert re.search` fails because the string does not contain the expected pattern, often due to incorrect regex or wrong input.

generic

中文

使用 pytest 的 `re.match` 或 `assert re.search` 的测试失败，因为字符串不包含预期的模式，通常是由于正则表达式错误或输入错误。

Workarounds

  1. 90% success 
    Test the regex separately: `import re; assert re.search(r'\d+', 'abc123')` to verify the pattern works.
  2. 95% success 
    Use raw strings for regex patterns to avoid escape issues: `r'\d+'`

Dead Ends

Common approaches that don't work:

  1. 70% fail

    This may not capture the exact pattern requirements and can lead to false passes.

  2. 85% fail

    This makes the test useless as it matches anything, defeating the purpose of validation.