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PCRE - Perl-compatible regular expressions
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.B int pcre_get_stringnumber(const pcre *\fIcode\fR,
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.B const char *\fIname\fR);
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This convenience function finds the number of a named substring capturing
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parenthesis in a compiled pattern. Its arguments are:
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\fIcode\fR Compiled regular expression
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\fIname\fR Name whose number is required
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The yield of the function is the number of the parenthesis if the name is
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found, or PCRE_ERROR_NOSUBSTRING otherwise.
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There is a complete description of the PCRE API in the