Need to Insert linebreak after 64 letters in a long string.

You could probably eliminate the cfloop altogether, since you're using the RegEx replace.

So, walk me through your code.

You're replacing all chr(10) and chr(13) with nothing, then you trim the string.  Then you loop and insert just a chr(13) every 64th position.

AFAIK, if you're using the Windows CF Server, both chr(13) AND chr(10) are the line break/carriage return codes.

Also, don't use hashmarks (#) for variables, unless the variable is either being output to the screen, or is inside the string delimiters.  (Doing <cfset outstr &= Mid(instr,p,64) & #chr(13)#> is not advised.  Remove the #'s around the chr(13).)

Hmm.. I haven't tested this, but try the following:

<cfset instr = trim(rereplace(arguments.value,"#chr(13)&chr(10)#|#chr(13)#|#chr(10)#","","all")) />
<!--- One way of removing all line breaks, and trimming; there are others --->
<cfset instr = rereplace(instr,"(.){64}","\1#chr(13) & chr(10)#","all") />
<!--- \1 is the backreference; equivalent to JavaScript RegEx $1 --->

Let me know if that works.

HTH,

^_^

UPDATE: I had a chance to test it, and with two minor corrections, it works.

<cfset instr = rereplace(instr,"(.{64})","\1#chr(13) & chr(10)#<br/>","all") />  The <br /> will display line breaks in the browser, but without it you can see the line breaks if you "View Source" the page.