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https://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=19fac8572a97e20376dea8d81fae594378cf0975
commit 19fac8572a97e20376dea8d81fae594378cf0975
Merge: 11d71e6 4b35dab
Author: Brad King <brad.k...@kitware.com>
AuthorDate: Wed Jul 18 15:09:56 2018 +0000
Commit: Kitware Robot <kwro...@kitware.com>
CommitDate: Wed Jul 18 11:10:02 2018 -0400
Merge topic 'doc-regex-notes'
4b35dab891 Help: Document how escape sequences work in a regex
Acked-by: Kitware Robot <kwro...@kitware.com>
Merge-request: !2221
https://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=4b35dab8916b9c88336a776eaaadd8e6746a50b6
commit 4b35dab8916b9c88336a776eaaadd8e6746a50b6
Author: Brad King <brad.k...@kitware.com>
AuthorDate: Wed Jul 18 10:23:26 2018 -0400
Commit: Brad King <brad.k...@kitware.com>
CommitDate: Wed Jul 18 10:36:00 2018 -0400
Help: Document how escape sequences work in a regex
Our regex engine doesn't interpret `\`-escapes but CMake language escape
sequences may be used to pass literal whitespace characters to it.
diff --git a/Help/command/string.rst b/Help/command/string.rst
index efa923b..29a153a 100644
--- a/Help/command/string.rst
+++ b/Help/command/string.rst
@@ -151,6 +151,20 @@ has lower precedence than concatenation. This means that
the regular
expression ``^ab+d$`` matches ``abbd`` but not ``ababd``, and the regular
expression ``^(ab|cd)$`` matches ``ab`` but not ``abd``.
+Backslash (``\``) characters in regular expressions are interpreted
+literally and do not escape anything or represent placeholders.
+However, CMake language :ref:`Escape Sequences` such as ``\t``,
+``\r``, ``\n``, and ``\\`` may be used to construct literal tabs,
+carriage returns, newlines, and backslashes (respectively) to pass
+in a regex. For example:
+
+* The quoted argument ``"[ \t\r\n]"`` specifies a regex that matches
+ any single whitespace character.
+* The quoted argument ``"[/\\]"`` specifies a regex that matches
+ a single forward slash ``/`` or backslash ``\``.
+* The quoted argument ``"[A-Za-z0-9_]"`` specifies a regex that matches
+ any single "word" character in the C locale.
+
Manipulation
^^^^^^^^^^^^
-----------------------------------------------------------------------
Summary of changes:
Help/command/string.rst | 14 ++++++++++++++
1 file changed, 14 insertions(+)
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