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Hint about [\] trick to avoid quad backslashes.

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Guido van Rossum 1997-03-14 04:10:13 +00:00
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Doc/lib/libregex.tex
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@ -22,9 +22,10 @@ is because Python doesn't remove backslashes from string literals if
they are followed by an unrecognized escape character.
\emph{However}, if you want to include a literal \dfn{backslash} in a
regular expression represented as a string literal, you have to
\emph{quadruple} it. E.g.\ to extract \LaTeX\ \samp{\e section\{{\rm
\emph{quadruple} it or enclose it in a singleton character class.
E.g.\ to extract \LaTeX\ \samp{\e section\{{\rm
\ldots}\}} headers from a document, you can use this pattern:
\code{'\e \e \e \e section\{\e (.*\e )\}'}. \emph{Another exception:}
\code{'[\e ] section\{\e (.*\e )\}'}. \emph{Another exception:}
the escape sequece \samp{\e b} is significant in string literals
(where it means the ASCII bell character) as well as in Emacs regular
expressions (where it stands for a word boundary), so in order to