I am trying to match a pattern with my input using regular expression .
I am trying to match the following string
00010_mesh_fbx_low_pileOfStoneAtWonwonsaTemple.fbx
using the following regular expression
std::regex("^[0-9]+_mesh_fbx_low_[a-z][A-Z][0-9].(?:fbx|glb|obj)"))
But I do not get a match for the input string
>Solution :
[a-z][A-Z][0-9]. matches a sequence of four chars: a lowercase ASCII letter, then an uppercase ASCII letter, then an ASCII digit and then any char other than line break chars.
You can fix your regex by using
std::regex(R"(^[0-9]+_mesh_fbx_low_[a-zA-Z0-9]+\.(?:fbx|glb|obj))")
std::regex(R"(^[0-9]+_mesh_fbx_low_\w+\.(?:fbx|glb|obj))")
where [a-zA-Z0-9]+ matches one or more ASCII alphanumeric chars, or \w+ that matches one or more ASCII alphanumeric or underscore chars.