regular expression

Question

(.[^_]+) 

Matches correctly when there is no underscore, how can I modify this regex to match when there is no underscore only before a question mark ?

ie. ignore any underscores after ?

Answer 1

This will only allow underscores after the question mark:

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

Answer 2

.[^_]*?\?.*

Anything except for underscore zero or more times, lazy quantifier (the shortest match), followed by a question mark. Another option:

.[^_\?]*\?.*

Answer 3

Put the question mark itself into your negated character class:

(.[^_?]+)

This will match all characters until it’s either an underscore or a question mark.