Regular Expressions 101

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[A-Z0-9\!\-]
/
Match a single character present in the list below
[A-Z0-9\!\-]
A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
\! matches the character ! literally (case sensitive)
\- matches the character - literally (case sensitive)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String