Question

I have these strings, I want to return regex confirm those patterns.

NS::varible.child // OK
variable.child // OK
NS:variable.child // NO MATCH
::variablename.child // OK
:variablename.child // NO MATCH
_variablename.child.x // OK
5variablename.child.x // NO MATCH

I want C++ variable name match without -> operator and template<>

I have come up with this regular expression.

[a-z\_:{2,2}A-Z][a-z\_A-Z0-9\.:{2,2}]*

:{2,2} doesn’t seem to be doing what I want. It accepts a single colon too.

How do I check exactly two colons? Even better a regex to match C++ variable constructs?

Answer 1

One of the options:

/^((::)?[_a-zA-Z.]+)+$/

Play with it online on Rubular.