Regex match after numbers before double underscore-CodePudding

I would like to extract substrings that start after a number and before a double underscore. Below you see two test strings and the expected output after ->.

'1234514 TEST STRING__blabla3452b' -> 'TEST STRING'
'16275653 TEST_STRING__bl67abla3452b' -> 'TEST_STRING'

The regex I came up with so far: (?:^|\n)\d ([^__] ) only returns the first but not the second output as the second underscore is not recognised. I tried to escape the underscores but that did not work. Any help would be very much apprecciated.

Thanks.

CodePudding user response：

You can use

^\d \s*(.*?)(?=__)
\d\s (.*?)(?=__)

See the regex demo #1 and regex demo #2.

Details:

^ - start of string
\d - one or more digits
\s* - zero or more whitespaces
(.*?) - Group 1: any zero or more chars other than line break chars as few as possible
(?=__) - a location immediately followed with __.