Regex.Match(line, "^\[(\w )[^_]]")

When the string contains underscore, I would like no match.

Example:

Line 1: [String] returns String

Line 2: [String_Ab] returns String_AB.

I would like to return line 1 match String removing the brackets. Skip Line 2 because the string contains underscore. Right now "^\[(\w )[^_]]"), returns String and String_AB.

CodePudding user response：

As a pattern to get a match only between square brackets without matching an underscore, you might use:

(?<=\[)[^][_]*(?=])

Explanation

• (?<=\[) Assert [ to the left
• [^][_]* Match optional chars other than [ ] and _
• (?=]) Assert ]` to the right

Regex demo

Or using a capture group

\[([^][_]*)]

Regex demo