BUG: Fix Series.str.contains with compiled regex on Arrow strings (#61942) #61945
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…dex with check_categorical=True and exact=False
That was previous changes
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#61942
This PR improves the handling of this case:
If the compiled regex has no flags, we extract the pattern string and proceed.
If the regex includes flags, a clear NotImplementedError is raised with guidance.
This avoids a confusing low-level PyArrow TypeError and ensures consistent behavior with non-Arrow strings.
Please , suggest feedback if my approach is not correct . I would love to improve and fix this.