Please can you give me some regular expression help

5 visualizaciones (últimos 30 días)
jlt199
jlt199 el 24 de Ag. de 2016
Editada: Thorsten el 24 de Ag. de 2016
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?

Respuesta aceptada

Andrei Bobrov
Andrei Bobrov el 24 de Ag. de 2016
regexp('H970D80Dia4W19L19WT856','(?<=D)\d+','match')
  2 comentarios
jlt199
jlt199 el 24 de Ag. de 2016
Thank you very much for your quick response
Thorsten
Thorsten el 24 de Ag. de 2016
Editada: Thorsten el 24 de Ag. de 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.

Iniciar sesión para comentar.

Más respuestas (1)

Thorsten
Thorsten el 24 de Ag. de 2016
c = regexp(file.name, 'D(\d+)', 'tokens')
  1 comentario
jlt199
jlt199 el 24 de Ag. de 2016
Thanks for your response too, both answers are very helpful

Iniciar sesión para comentar.

Categorías

Más información sobre Characters and Strings en Help Center y File Exchange.

Productos

Community Treasure Hunt

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

Start Hunting!

Translated by