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ippStsRegExpChClassErr
This status isolates a problem inside a character class. The surrounding pattern may be well formed, but the bracket expression itself contains syntax that IPP cannot compile.
Common causes include an unterminated class, a range whose endpoints are reversed or escaped incorrectly, a literal hyphen in the wrong place, or locale/encoding assumptions copied from another regex implementation.
What to inspect
- The final pattern bytes after application escaping.
- Ranges such as
a-zand any generated endpoints. - Literal
],-, and^characters inside the class.
Intel IPP RegExp functions · Perl regular expression reference
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