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tightened up the definition of \b and \B some more based upon discussion 

after the last checkin.
This commit is contained in:
Skip Montanaro 2002-09-07 18:48:14 +00:00
parent 522076d1d6
commit 2c0d3224fc
1 changed files with 10 additions and 6 deletions
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16
Doc/lib/libre.tex
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@ -322,13 +322,17 @@ escapes are treated as characters.
\item[\code{\e b}] Matches the empty string, but only at the
beginning or end of a word. A word is defined as a sequence of
alphanumeric or underscore characters , so the end of a word is indicated by
whitespace or a non-alphanumeric, non-underscore character. Inside a character range,
\regexp{\e b} represents the backspace character, for compatibility with
Python's string literals.
alphanumeric or underscore characters, so the end of a word is indicated by
whitespace or a non-alphanumeric, non-underscore character. Note that
{}\code{\e b} is defined as the boundary between \code{\e w} and \code{\e
W}, so the precise set of characters deemed to be alphanumeric depends on the
values of the \code{UNICODE} and \code{LOCALE} flags. Inside a character
range, \regexp{\e b} represents the backspace character, for compatibility
with Python's string literals.
\item[\code{\e B}] Matches the empty string, but only when it is
\emph{not} at the beginning or end of a word.
\item[\code{\e B}] Matches the empty string, but only when it is \emph{not}
at the beginning or end of a word. This is just the opposite of {}\code{\e
b}, so is also subject to the settings of \code{LOCALE} and \code{UNICODE}.
\item[\code{\e d}]Matches any decimal digit; this is
equivalent to the set \regexp{[0-9]}.