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https://issues.apache.org/jira/browse/VELOCITY-587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12567715#action_12567715
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Christopher Schultz commented on VELOCITY-587:
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Even though it's possible to use the single-quotes to get a single backslash, 
escaping within double-quotes does seem a bit inconsistent.

Given that the backslash-escaping idiom has been adopted from programming 
languages, it would be nice to be consistent with their behavior. That is, \\ 
ought to yield \ in all cases, possibly including single-quoted strings.

> The VTL does not have a trivial construction for strings containing a single 
> backslash (\)
> ------------------------------------------------------------------------------------------
>
>                 Key: VELOCITY-587
>                 URL: https://issues.apache.org/jira/browse/VELOCITY-587
>             Project: Velocity
>          Issue Type: Bug
>            Reporter: Jon Seymour
>            Priority: Minor
>
> The VTL doesn't currently provide a way to express strings containing a 
> single backslash (\)
>     #set($backslash="\") 
> results in a lexical error during template parsing.
>    #set($backslash="\\")
> results in $backslash being assigned a string containing two backslashes (\\)
> It appears the only workaround available now is to construct a variable 
> containing just  a single backslash with this idiom:
>    #set($twobackslashes="\\")
>    #set($backslash=$twobackslashes.substring(0,1))
> Even if this can't be fixed in the parser, the documentation should be 
> updated to define a preferred idiom for obtaining a string containing a 
> single backslash.
> jon.
> note: this issue partially duplicates a comment by Guido Deinhammer on issue 
> #454 regarding other escaping issues. I have raised a separate issue, so that 
> this one can be addressed separately, if desired.

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