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Displaying Session variables with multiple levels of indirection

Posted on 2007-11-15
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Last Modified: 2013-12-24
I am trying to provide macro-like substitutions for strings from an input file. The input file might have the string "The user is: !user!."

Suppose Session.user = "Steve"

I want to output the string with !user! replaced with the value of "Session.user".

If I use:
       <cfset line = REreplaceNoCase(#line#, '!(.*)!', '#Session.user#')>
       <cfset line = "#line#">

I get "The user is: Steve." That is, this works, but "!xxxxxx!" would be replace with the value of Session.user.

If I use:
       <cfset replaceString = "Session.\1">
       <cfset line = REreplaceNoCase(#line#, '!(.*)!', '#replaceString#')>
       <cfset line = "#line#">
                      <cfoutput>#line#</cfoutput>

I get "The user is: Session.user."

If I use:
       <cfset replaceString = "Session.\1">
       <cfset testReplace = "#replaceString#">
       <cfset line = REreplaceNoCase(#line#, '!(.*)!', '#testReplace#')>
       <cfset line = "#line#">
                      <cfoutput>#line#</cfoutput>

I get "The user is: Session.user."

If I use:
       <cfset replaceString = "Session.\1">
       <cfset testReplace = "###replaceString###">
       <cfset line = REreplaceNoCase(#line#, '!(.*)!', '#testReplace#')>
       <cfset line = "#line#">
                      <cfoutput>#line#</cfoutput>

I get "The user is: #Session.user#."

I need to have two evaluations. Thanks much for any help.
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Question by:stevenschulman
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by:_agx_
Comment Utility
Perhaps I'm missing something but is there a reason a straight replace wouldn't work?


<cfset theNewLine = replace(line, '!user!', Session.user, "all")>

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Expert Comment

by:James Rodgers
Comment Utility
>>I want to output the string with !user! replaced with the value of "Session.user".

If I use:
       <cfset line = REreplaceNoCase(#line#, '!(.*)!', '#Session.user#')>
       <cfset line = "#line#">

I get "The user is: Steve." That is, this works, but "!xxxxxx!" would be replace with the value of Session.user.

isn't that what you want? or am i not reading the first line right?
what output are you looking to achieve?
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Author Comment

by:stevenschulman
Comment Utility
!user! is only an example. If the text were "Hello !firstName! !lastName!" then !firstName! would be substituted with the value of Session.firstName and !lastName! would be substituted with the value of Session.lastName.
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Expert Comment

by:James Rodgers
Comment Utility
then you should not use a regex but a specific replace
<cfset temp=#replace(line,"!somestring!", #session.somestring#,'all')>
reg ex is for pattern matching you need exact matching

the pattern you are using, !(.*)!',  will match !user!  and !xxxxxx! but it would also match
this sentence ending an an exclamation! and the next sentence ending in an exclamation!
would look like this
this sentence ending an an exclamationSteve
so use exact match replacement
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Author Comment

by:stevenschulman
Comment Utility
I understand that, but with regular expressions whatever is enclosed in parenthesis is returned and reusable as \n. Thus, in this case, "!(.*)!" matches all characters between two exclamaition points and provides the specific values matched in "\1|. That is why I use "Session.\1". This does, in fact, work. I get the value "Session.user" or "Session.firstName" or "Session.lastName". The problem is that I have the string, but can not seem to go the next step to have it evaluated.

I tried using Evaluate() function. I suspect that the answer lies there somewhere, but I still can not get it to work.
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Accepted Solution

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James Rodgers earned 500 total points
Comment Utility
of then set the replace as #session.\1*

and tehn before pout[utting try this

#de(line)#
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