Please can you give me some regular expression help

1 view (last 30 days)
Hi,
I'm trying to extract a number from a string. The string is of the form H970D80Dia4W19L19WT856 and I want to extract the number after the 'D', in this case 80. But regular expressions are confusing me, I can get this far
regexp(file.name,'[D]\d+','match')
Which gives 'D80', but I can't get rid of the 'D'. Can you help me with this? The strings may be different lengths and can have a different number of characters to the left and right of what I want to extract.
Also is there a good cheat sheet I can print for future reference?

Accepted Answer

Andrei Bobrov
Andrei Bobrov on 24 Aug 2016
regexp('H970D80Dia4W19L19WT856','(?<=D)\d+','match')
  2 Comments
jlt199
jlt199 on 24 Aug 2016
Thank you very much for your quick response
Thorsten
Thorsten on 24 Aug 2016
Edited: Thorsten on 24 Aug 2016
(?<=D) is a "positive look behind assertion" which is itself not part of the match: The match is only valid if there is a "D" in front of it. Nice solution.

Sign in to comment.

More Answers (1)

Thorsten
Thorsten on 24 Aug 2016
c = regexp(file.name, 'D(\d+)', 'tokens')

Categories

Find more on Get Started with MATLAB in Help Center and File Exchange

Products

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!