Open System Services Library Calls Reference Manual (G06.29+, H06.08+, J06.03+)

OSS Library Calls (a - d) advance(3)
compile (patstr, expbuf, &expbuf[ESIZE], ’\0’);
...
if (step (linebuf, expbuf))
succeed( );
...
RETURN VALUES
Whenever a successful match occurs, the advance( ) macro returns a nonzero value. Upon
failure, this macro returns a value of 0 (zero).
ERRORS
None. This macro does not set errno.
RELATED INFORMATION
Functions: compile(3), isalpha(3), regcomp(3), regexec(3), step(3).
Commands: ed(1), sed(1), grep(1).
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