Need help with a regex pattern

I am not very good with RegEx yet so please bear with me.



I need to put RegEx in an RPGLE program that is similar to the following
(this came from an SQL RegExp_Like)



'[^A-Za-z0-9_@#$]'||trim(field)||'[^A-Za-z0-9_@#$]'



I am programmatically searching source for variable names and this regex
eliminates anything with a valid variable name char before or after the
variable. For example, if I am searching for ACCT, this would eliminate
ACCT01 or EXPACCT but not ACCT, or ACCT)



It is my understanding that I need to compile the expression into a pattern
and then use that pattern to compare to my string. However, as you can see
from the original above, there is a variable value in the middle of my
expression.



Is there a way to build an expression so I can provide a variable value at
run time rather than freeing and recompiling the pattern every time the
variable changes?