Program - Need a regular expression to validate a string with the following rules:?

Question

1.   Contains only characters a-z, A-Z, 0-9, @, #, and $.

2.   First character in the string must be an alphabetic character, @, #, or $. (i.e. not a number)

3.   Cannot be a number or the letter sequences SYS, PGM, or APL.

4.   Length of 3 characters minimum and 8 characters maximum.

I think I've got the first three covered with:

^(((?!DBM|IBM|SYS)^[a-zA-Z])[a-zA-Z0-9@#$]{3,8})+$

But, I can't get the 4th rule (length) working.  I'm new to this, so any help is greatly appreciated

Answer

I'm pretty good with these, but I don't see how to do this in a single expression.  How do you say "this pattern unless it's SYS, PGM, or APL?"  I think you'd first test if (SYS|PGM|APL) and if it matches, it's a fail, and if it doesn't, then test against ^[a-zA-Z@\#\$][a-zA-Z0-9@\#\$]{2,7}$

Program - Need a regular expression to validate a string with the following rules:?

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