Issue with regular expressions in C++

Question

I tried to use the following regular expression, which already works in C#, in C++ as well but it\'s not working in C++.

Answer 1

Here you go, all % in string must be compliant.
If so, match the entire string, if not, don't match
the string.

I suggest you do this with i.e. if ( regex_search( sTarget, sRx, sMatch, flags ) )
but regex_match() would do the same thing.

^(?:[^%]*%(?:\.[0-9]*)?[a-z])+[^%]*$

Expanded

 ^                             # BOS
 (?:                           # Cluster begin
      [^%]*                         # Not % characters
      %                             # % found
      (?: \. [0-9]* )?              # optional .###
      [a-z]                         # single a-z required
 )+                            # Cluster end, 1 to many times
 [^%]*                         # Not % characters
 $                             # EOS