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.TH PCRE_GET_SUBSTRING 3 .SH NAME PCRE - Perl-compatible regular expressions .SH SYNOPSIS .rs .sp .B #include <pcre.h> .PP .SM .B int pcre_get_substring(const char \fIsubject\fP, int \fIovector\fP, .ti +5n .B int \fIstringcount\fP, int \fIstringnumber\fP, .ti +5n .B const char **\fIstringptr\fP); . .SH DESCRIPTION .rs .sp This is a convenience function for extracting a captured substring. The arguments are: .sp \fIsubject\fP Subject that has been successfully matched \fIovector\fP Offset vector that \fBpcre_exec()\fP used \fIstringcount\fP Value returned by \fBpcre_exec()\fP \fIstringnumber\fP Number of the required substring \fIstringptr\fP Where to put the string pointer .sp The memory in which the substring is placed is obtained by calling \fBpcre_malloc()\fP. The convenience function \fBpcre_free_substring()\fP can be used to free it when it is no longer needed. The yield of the function is the length of the substring, PCRE_ERROR_NOMEMORY if sufficient memory could not be obtained, or PCRE_ERROR_NOSUBSTRING if the string number is invalid. .P There is a complete description of the PCRE native API in the .\" HREF \fBpcreapi\fP .\" page and a description of the POSIX API in the .\" HREF \fBpcreposix\fP .\" page.