Question

I currently have a coldfusion regex that checks whether a string is alphanumeric or not.
I would like to open that up a bit more to allow period and underscore characters. How would I modify this to allow that?

<cfset isValid= true/>
<cfif REFind("[^[:alnum:]]", arguments.stringToCheck, 1) GT 0>
 <cfset isValid= false />
</cfif>

Thanks

Answer 1

This should do it.

<cfset isValidString= true/>
    <cfif REFind("[^[:alnum:]_\.]", arguments.stringToCheck, 1) GT 0>
    <cfset isValidString= false />
</cfif>

Also using “isValid” for a variable name is not a great practice. It is the name of a function in ColdFusion and could cause you issues someday.