The regex() function follows more or less a Posix/Unix specification as I was told by IBM support.

Here are two links that may help. The first one was shared by IBM support:

https://pubs.opengroup.org/onlinepubs/007908799/xbd/re.html
https://www.regular-expressions.info/posixbrackets.html

Thomas.

Am 25.03.2020 um 22:41 schrieb Javier Sánchez:
Good day everyone.

I am using C/C++ Runtime Library's regexec() function(s), called from ILE
RPG programs.
Documentation tells this complies with the POSIX regex engine syntax. Can
someone let me know, please, where is probably the best documentation about
the exact syntax that regexec() will match a regular expression, in terms
of POSIX compliance?

I've found some comments about shortcuts not being supported. For example,
"\d+" is supposedly not supported, and instead one should use "[0-9]+".
But, if I use the former regex, regcomp() compiles ok, but regexec() does
not match any single digit sequence like "123456789", until I use "[0-9]+"
. I think if it's not supported, regcomp() it shouldn't even succeed.

It's very likely this may not be the place to ask. Please advise also if
so.

Thanks in advance.



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