[cmake-developers] [CMake 0013790]: regex replace does not allow anchored empty matches

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://public.kitware.com/Bug/view.php?id=13790 
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Reported By:                mwoehlke
Assigned To:                
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Project:                    CMake
Issue ID:                   13790
Category:                   CMake
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             2012-12-13 13:48 EST
Last Modified:              2012-12-13 13:48 EST
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Summary:                    regex replace does not allow anchored empty matches
Description: 
string(REGEX REPLACE) fails with error 'string sub-command REGEX, mode REPLACE
regex <pattern> matched an empty string.' when the regular expression is
anchored. Since the position of the match is non-ambiguous when an anchor is
present, the replace should succeed, even if the substring being replaced is
empty. (Other tools, e.g. sed, are able to do this.)

Steps to Reproduce: 
set(FOO foo)
string(REGEX REPLACE "$" "_suffix" BAR "${FOO}")

(Expected result: BAR contains "foo_suffix")

Additional Information: 
The above example is contrived for the sake of simplification. An actual use
case might be replacing an existing prefix/suffix that matches a regular
expression and may or may not be present.
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Issue History 
Date Modified    Username       Field                    Change               
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2012-12-13 13:48 mwoehlke       New Issue                                    
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