This question already has an answer here:
I try to find all in one golang regexp rules/specification/accepted syntax. However as it turned out - it's not simple task. There is some resource I've found:
There first one it is almost what I need, but there is so many complicated moments where I just doesn't understand what's going on (no legenda and no explanations - only for those who already know something). See some examples below:
\d Perl character class #what does it have with Perl?
[[:name:]] named ASCII class inside character class (≡ [:name:])
Could anybody help me?
</div>
The official documentation is http://golang.org/pkg/regexp/syntax/
Perl in particular is a programming language. From the Wikipedia entry on Perl:
Perl 5 gained widespread popularity in the late 1990s as a CGI scripting language, in part due to its unsurpassed regular expression and string parsing abilities.