使用正则表达式捕获具有特殊字符的第一个匹配项

Question

If given (TEXT)testest (GOPHER)mytest (TAG)(not_this),

I want to grep only the first occurrence of characters inside parentheses.

The regex results need to be TEXT, GOPHER, TAG, but NOT not_this because this is not the first occurrence in that word phrase. And the grepped text should be only letters not numbers.

regexp.MustCompile(`(?i)\([a-z0-9_-])+\]`)
// is not working

How do I write the regular expression to grep this? Thank you in advance!

Answer 1

I think the regex you are looking for is:

(?:^|\W)\(([\w-]+)\)

Meaning:

(?:^|\W) /* find but discard the sequence-start or a non-word character */

\(CONTENTS\) /* Contained in () */

(CONTENTS) /* Selection Group */

[\w-]+ /* word character or -, once or more */