I have requirement to allow alphanumeric and certain other characters for a field. I am using this regular expression:

 "^[a-zA-Z0-9!@#$&()-`.+,/\"]*$".

The allowed special characters are! @ # $ & ( ) - ‘ . / + , “

But when I test the pattern with a string "test_for_extended_alphanumeric" , the string passes the test. I don't have "_" allowed in the pattern. What am I doing wrong?

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