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Please can you give me some regular expression help

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jlt199
jlt199 2016-8-24
编辑： Thorsten 2016-8-24
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?

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2016-8-24
regexp('H970D80Dia4W19L19WT856','(?<=D)\d+','match')
  2 个评论
Thorsten
Thorsten 2016-8-24
编辑：Thorsten 2016-8-24
(?<=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.

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更多回答（1 个）

Thorsten
Thorsten 2016-8-24
c = regexp(file.name, 'D(\d+)', 'tokens')

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