php - regex \p{L} problems -

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is using it for my validation: 

  $ space = "[: Blank:] "; $ Number = "0-9"; $ Letters = "\ p {l}"; $ Specially = "-_.::='\/& amp; *% +, ()"; ... $ default = "/^[".$space.$number.$letter.$specialchar."]*$/"; If (! Preg_match ($ all, $ input)) {$ error = true; }

I have a problem: all the "ü" are working except ... "Ü", but "ü" is not and I do not know why? \ P {L} should accept all letters and special characters ... Why do not I get why she does not do the job :(
Is anyone an idea that I can do?
The data I validate is the POST value of a registration form

// ps if im is using \ p {L} ü I get an error like this: 

  Compilation Failed: Out of the order in the offset class in offset 23 ...   
 
 
 Avoid dashes:  
  $ specialchar = "\ -_.:! = '\ / & Amp; *% +, ()"; # here __ ^  
 
 besides  add / u  Modifier for Unicode Match: 
   $ default = "/^[".$space.$number.$letter.$specialchar_def."]*$/u" ## __ ^

Test: 

  $ space = "[: blank:]" $ number = "0-9" ; $ Letters = "\ p {l}"; $ specially = "\ -_. :: :: '' \ / & Amp; *% +, ()"; $ default = "/^[".$space.$ No. $. $ Exclusively. "] * $ / U"; // Wrong variable is not my example ^^^^^^^^^^^^ $ input = 'üÜ but'; If (! Preg_match ($ default, $ input)) {echo "to \ n"; } And {echo "ok \ n"; }

Output: 

  OK

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