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RE_COMP(3) BSD Library Functions Manual RE_COMP(3) NAME
re_comp, re_exec -- regular expression handler LIBRARY
Compatibility Library (libcompat, -lcompat) SYNOPSIS
#include <unistd.h> char * re_comp(const char *s); int re_exec(const char *s); DESCRIPTION
This interface is made obsolete by regex(3). The re_comp() function compiles a string into an internal form suitable for pattern matching. The re_exec() function checks the argument string against the last string passed to re_comp(). The re_comp() function returns 0 if the string s was compiled successfully; otherwise a string containing an error message is returned. If re_comp() is passed 0 or a null string, it returns without changing the currently compiled regular expression. The re_exec() function returns 1 if the string s matches the last compiled regular expression, 0 if the string s failed to match the last compiled regular expression, and -1 if the compiled regular expression was invalid (indicating an internal error). The strings passed to both re_comp() and re_exec() may have trailing or embedded newline characters; they are terminated by NULs. The regu- lar expressions recognized are described in the manual entry for ed(1), given the above difference. DIAGNOSTICS
The re_exec() function returns -1 for an internal error. The re_comp() function returns ``no previous regular expression'' or one of the strings generated by regerror(3). SEE ALSO
ed(1), egrep(1), ex(1), fgrep(1), grep(1), regex(3) HISTORY
The re_comp() and re_exec() functions appeared in 4.0BSD. BSD
June 4, 1993 BSD