re_comp, re_exec - Handle regular expressions
Standard C Library (libc.so, libc.a)
Interfaces documented on this reference page conform to industry standards as follows:
re_comp(), re_exec(): XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
Points to the string that is to be matched or converted.
The re_comp() function converts a string into an internal form suitable for pattern matching. The re_exec() function compares the string pointed to by the string parameter with the last string passed to the re_comp() function.
When the re_comp() function is passed a value of 0 (zero) or NULL, the regular expression currently being converted remains unchanged.
Strings passed to both the re_comp() and re_exec() functions may have trailing or embedded newline characters; however, these strings are terminated by a zero byte.
The re_comp() and re_exec() functions support simple regular expressions, which are defined in the grep(1) reference page.
The re_comp() and re_exec() interfaces are scheduled to be withdrawn from a future version of the X/Open CAE Specification.
These interfaces are obsolete; they are guaranteed to function properly only in the C/POSIX locale and should be avoided. Use the POSIX regcomp() interface in place of re_comp() and re_exec().
The re_comp() function returns a value of 0 (zero) when the string pointed to by the string parameter is successfully converted; otherwise, an error message string is returned.
Upon successful completion, the re_exec() function returns a value of 1 if string matches the last compiled regular expression. Otherwise, the re_exec() function returns a value of 0 (zero), if string fails to match the last compiled regular expression, and a value of -1, if the compiled regular expression is invalid (indicating an internal error).
Standards: standards(5) delim off