[ruby-core:27374] [Bug #2547] error when interpolating a string containing a single backslash into a regexp
caleb clausen
http://redmine.ruby-lang.org/issues/show/2547
Author: caleb clausen
Status: Open, Priority: Normal
ruby -v: ruby 1.9.1p376 (2009-12-07 revision 26040) [x86_64-linux]
An error is raised if an interpolation in a regexp contains a string containing a single backslash. This case used to work just great in ruby 1.8. For example:
$ ruby19 -e 'a="\\"; p /#{a}y/'
-e:1:in `<main>': too short escape sequence (ArgumentError)
Note that if the string literal is inlined directly into the interpolation, the error does not happen. I'd guess that ruby optimizes this case away at parse time, and thus sidesteps the error:
$ ruby19 -e 'p /#{"\\"}y/'
/\y/
I've tested this in 1.9.1; presumably 1.9.2 has the same behavior, but I don't have a 1.9.2 readily available.
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Yui NARUSE
Status changed from Open to Assigned
Assigned to set to Yukihiro Matsumoto
trunk also reproduce this.
However this may be a feature:
* Ruby's regexp forbids to split character escape like 'a="\\"; p /#{a}y/'
* /#{"\\"}y/ is optimized as /\\y/ on parser, so this is valid
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http://redmine.ruby-lang.org/issues/show/2547
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caleb clausen
I can see why it would be easier to forbid splitting up escape sequences in regexp. But:
1) Ruby 1.8 did handle this; it can't be all that impossible.
2) If splitting escapes is forbidden, then for consistency, the directly inlined version should be forbidden as well.
Nobuyoshi Nakada
Status changed from Assigned to Closed
% Done changed from 0 to 100
This issue was solved with changeset r27431.
caleb, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.
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