java - Why string.matches("^[A-Z0-9\\-\\_]+") not working when i am giving value of string by manipulating another string, - 


string astr="test-1-tv_50"; system.out.println(astr.matches("^[a-z0-9\\-\\_]+")); //true.

but why not working..?

string astr1= "$local:test12-1-tv_50 xs:boolean";  int strtindex=astr.indexof(":"); int endindex=astr.indexof("as");  string extractedstr=astr1.substring(strtindex+1,endindex);  //test12-1-tv_50   system.out.println(extractedstr.matches("^[a-z0-9\\-\\_]+")); //false.

why giving result false.???

there's trailing space in extractedstr.

so contains "test12-1-tv_50 " (not there's space after final 0).

you can either replace endindex astr.indexof(" as") (starting space) or call trim() on extractedstr:

string extractedstr=astr1.substring(strtindex+1,endindex).trim();

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