Regex match after numbers before double underscore

user_9473505 0
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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.

python regex
1 Answers

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 __.
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