Avoid <regex> (for now)

[ax3l]

As discussed in #210, we will try to also support GCC 4.8.

For this to work, the only thing we will need to change is the use of <regex> inside the library, as it is only implemented as a stub in GCC 4.8.

Possible alternatives are:

• own, simple string matcher for file names
• use another light-weight regex library, e.g. slre

For reference, this is what needs to be solved.

[ax3l]

@C0nsultant if you have an idea how to implement this efficiently, feel free to say how or go ahead. I just tried to quickly hack it but needs more thinking.

[C0nsultant]

You weren't far off. The only thing you didn't consider are the troubles caused by having both a prefix and a postfix.
I'll look into it.

[ax3l]

Since it's a GCC 4.8 only issue, we could also use the POSIX <regex.h> header or the regex lib from glibc here as a fallback.

Resources:

• https://stackoverflow.com/questions/31628536/what-is-difference-between-c-and-c-regex
• http://lh3lh3.users.sourceforge.net/reb.shtml

[ax3l]

Ok, I have a new draft based on the POSIX C <regex.h>