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


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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