php - Whats wrong with this regular expression? -


I have the following regular expressions for finding words and exposing them in the text

The word surface Using the test objective. 

  / ((?? Lt; = [\ W]) surface? (?! [\ W])). (?????)? Surface? (? = [\ W])) / iu

This corresponds to all events in the following text.

Surface-to-20-70-0000 -04-02_Pre-Run_Tool_Verification_Programming_and_surface_Tare surface_revC.pdf

But if I surface to keep the upper case letter I first change the event, so it only matches the first event.

Surface-cum-20-70-0000-04-02_Pre-Run_Tool_Verification_Programming_and_surface_Tare surface_revC.pdf

Or if I have an upper case letter in some other incidents , Then matches it

surface-cum-20-70-0000-04-02_Pre-Run_Tool_Verification_Programming_and_Surface_Tare surface_revC.pdf

I do not know what you are trying to achieve there, but your problem is probably that \ w will contain _ (and \ w )).

Perhaps try this: 

  / (? & Lt;! [Az]) surface (?! [Az]) / iu

or this: 

  / (? & Lt; = [\ W_] surface (? = [\ W_]) / iu


Update: This information is given:

Surface-2010 should not be matched

In that case, I suspect you want: 

  / (? & Lt; = \ b | _) surface (? = \ B | _) / iu

(Since just \ b will match a match with "... and_forfest ..." so that we can add _ to include in it Option.)


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