c# - Regex.IsMatch returns true when shouldn't -

March 15, 2012

I have a Regex pattern, which is all alphanumeric characters, and - , _ < / Code>, . and location

   "[A-Za-z0-9-_.] +"  
  I have a string with this code Trying to use  Regex.IsMatch , but it returns  true . Why? 
   string pattern = "[A-Za-z0-9-_.] +"; String input = "RTGF & amp; ** ((& amp;; bool is match = regesx.ismatch (input, pattern); // is true, why?

  
  This matches because your string contains one or more characters in  [A-Za-z0- 9-_.] If you want  only  to set, change your pattern to:  
  string pattern = "^ [azza-j 0-9] -D.] + $ ";  
  This pattern breaks from the beginning to the end of the string to match If you will.


















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