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| Recoverable Error | |||||
Invalid pattern.
These messages are given for patterns which either are not supported by the language or are impossible to match. For example, nothing can match word-end line-start, so such a pattern is not accepted.
Additional Information
Can't have only LOOKAHEAD inside a '*' or a '+'.
or
Can't save text inside a LOOKAHEAD, '*', or '+'.
or
Consecutive 'X' subpatterns must be separated by parentheses. The last
'X' subpattern is followed by 'Y'.
where X is lookahead or lookahead not.
or
'X' positional patterns may appear only at the 'Y' of a compound
pattern.
or
where X is content-end, content-start,
value-end, or value-start, and Y is 'end' or 'start'.
or
Only 'X' positional patterns can directly precede 'Y'.
or
Only 'X' positional patterns can directly follow 'Y'.
or
Only one EXCEPT is allowed in a character set.
or
The positional pattern 'X' is not allowed in the current pattern.
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