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| -rw-r--r-- | Help/command/string.rst | 14 |
1 files changed, 14 insertions, 0 deletions
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 ^^^^^^^^^^^^ |