用于匹配“global::”前缀完全限定 C# 类型名称的正则表达式

Question

I'm trying to match fully qualified C# type names, but the + after \w+ captures too much:

global((::|\.)\w+(?!\s|\())+

Tried to play with quantifiers and negative lookahead but without success.

Online sandbox:

https://regex101.com/r/L6Y8kv/1

Sample:

    public global::libebur128.EBUR128StateInternal D
    {
        get
        {
            var __result0 = global::libebur128.EBUR128StateInternal.__GetOrCreateInstance(((__Internal*)__Instance)->d, false);
            return __result0;
        }

Result:

global::libebur128.EBUR128StateInterna
global::libebur128.EBUR128StateInternal.__GetOrCreateInstanc

Expected:

global::libebur128.EBUR128StateInternal
global::libebur128.EBUR128StateInternal

Answer 1

For the example data, you might use:

\bglobal::[^\W_]+(?:\.[^\W_]+)*

The pattern matches:

• \bglobal:: A word boundary, followed by matching global::
• [^\W_]+ Match 1+ word characters excluding _
• (?:\.[^\W_]+)* Optionally repeat matching . and 1+ word characters excluding _

See a regex101 demo .

If the last part should not be followed by ( and you don't want to take the underscore into account, you might add a word boundary and a negative lookahead:

\bglobal::\w+(?:\.\w+)*\b(?!\()

The pattern matches:

• \b A word boundary
• global:: Match literally
• \w+ Match 1+ word chars
• (?:\.\w+)* Optionally repeat . and 1+ word chars
• \b A word boundary (to prevent backtracking to make the next assertion true)
• (?!\() Negative lookahead, assert not ( directly to the right of the current position

regex101 demo