regex with some special characters allowed

I want regex with following conditions:

• As first character only A-Za-z is allowed.

• After first character the following is allowed: A-Z a-z 0-9 and the special characters .-_/

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I wrote this regex:

^[A-Za-z][A-Za-z0-9.-_\/]+$

But this allows also different special characters like : ? ! which is wrong.

I hope somebody can help me

Thanks in advance 🙂

>Solution :

It is due to the -, which denotes a range. Use the following with - escaped:

Pattern p = Pattern.compile( "^[A-Za-z][A-Za-z0-9.\\-_/]+$" );

Example inputs and results: