[cmake-developers] regex bug?

[David Cole]

For the replacement string, you need to use "\\1" -- the backslash in that
context needs to be escaped to get through the CMake language, so that the
regex engine sees "\1" internally...



On Thu, Dec 13, 2012 at 1:38 PM, Matthew Woehlke <
matthew.woehlke at kitware.com> wrote:

> Consider this line of CMake code:
>
> string(REGEX REPLACE "^([^.]*)(\..*)?$" "\1" BAR "${FOO}")
>
> It looks reasonable to me, and works fine on !Windows. However, on
> Windows, I get these errors:
>
> Syntax error in cmake code at <elided> when parsing string
> ^([^.]*)(\..*)?$
> Invalid escape sequence \.
>
> Syntax error in cmake code at <elided> when parsing string
> \1
> Invalid escape sequence \1
>
>
> Is this expected? The documentation doesn't seem to explicitly mention
> replacement placeholders, but they are implicitly mentioned when talking
> about () capturing.
>
> Also, I can use "^([^.]*)([.].*)?$" instead to get around the first error,
> but then I get an error that the capture is empty. (It shouldn't be;
> "${FOO}" is non-empty and the pattern is guaranteed to have a non-ambiguous
> match for non-empty input.)
>
> --
> Matthew
>
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