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ippStsRegExpMetaChErr
This status is raised when the IPP RegExp compiler sees a metacharacter sequence it cannot interpret. It is broader than a grouping or character-class failure and often points to escape handling.
When a pattern is generated, log both the intended expression and the exact runtime string. Escapes that are correct for one layer can become plain characters, doubled escapes, or unsupported metasequences by the time IPP compiles the pattern.
Practical checks
- Search for trailing backslashes and incomplete escape sequences.
- Compare the pattern against the subset of Perl-compatible syntax supported by the IPP implementation.
- Avoid silently falling back to a different regex engine, because match semantics may change.
Intel IPP RegExp functions · Perl regular expression reference
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