Remove documentation for BOW, EOW, WORD, and WORD+, as they have no

POSIX counterparts, and their meaning is locale-dependent.

doc/scsh-manual/sre.tex

@@ -72,8 +72,6 @@ providing:
 \item repetition (\ex{*}, \ex{+}, \ex{?}, \ex{\{$m$,$n$\}})
 \item character classes (\eg, \ex{[aeiou]}) and wildcard (\ex{.})
 \item beginning/end of string anchors (\verb|^|, \verb|$|)
-\item beginning/end of line anchors
-\item beginning/end of word anchors
 \item case-sensitivity control
 \item submatch-marking
 \end{itemize}
@@ -132,19 +130,12 @@ the next section is a friendlier tutorial introduction.
 \\
 \ex{bos eos}    & Beginning/end of string \\
 \ex{bol eol}    & Beginning/end of line \\
-\ex{bow eow}	& Beginning/end of word \\
 \end{tabular}
 \caption{SRE syntax summary (part 1)}
 \end{boxedfigure}
 
 \begin{boxedfigure}{tbhp}
 \begin{tabular}{lp{3in}}
-\ex{(word  \var{sre} {\ldots})}	& (: bow \var{sre} {\ldots} eow) \\
-\ex{(word+ \var{cset-sre} {\ldots})}
-               & \cd{(word (+ (& (| alphanumeric "_")} \\
-               & \cd{            (| \var{cset-sre} {\ldots}))))} \\
-\ex{word}	& \ex{(word+ any)} \\
-\\
 \ex{(posix-string \var{string})}        & Escape for Posix string notation \\
 \\
 \ex{\var{char}}         & Singleton char set \\
@@ -212,7 +203,7 @@ The chars are taken in pairs to form inclusive ranges.
              | (w/case <cset-sre>)              
              | (w/nocase <cset-sre>)            
 \end{verbatim}
-\caption{%The \cd{~}, \cd{-}, \cd{&}, and \cd{word+} operators may only be
+\caption{%The \cd{~}, \cd{-}, and \cd{&} operators may only be
          applied to SRE's that specify character sets. 
          These are the ``type-checking'' rules for character-set SRE's.}
 \end{boxedfigure}
@@ -705,10 +696,10 @@ to produce a certain number of submatches---if that is part of \var{exp}'s
 ``contract.''
 
 
-\paragraph{String, line, and word units}
+\paragraph{String and line units}
 
-The regexps \ex{bos} and \ex{eos} match the empty string at the beginning and
+The regexps \ex{bos} and \ex{eos} match the empty string at the
-end of the string, respectively.
+beginning and end of the string, respectively.
 
 The regexps \ex{bol} and \ex{eol} match the empty string at the beginning and
 end of a line, respectively. A line begins at the beginning of the string, and
@@ -717,32 +708,6 @@ just before every newline character. The char class \ex{nonl} matches any
 character except newline, and is useful in conjunction with line-based pattern
 matching.
 
-The regexps \ex{bow} and \ex{eow} match the empty string at the beginning and
-end of a word, respectively. A word is a contiguous sequence of characters
-that are either alphanumeric or the underscore character.
-
-The regexp \ex{(word \var{sre} \ldots)} surrounds the sequence 
-\ex{(: \var{sre} \ldots)}with bow/eow delimiters. It is equivalent to
-\begin{code}
-(: bow \var{sre} \ldots eow)\end{code}%
-%
-
-The regexp \ex{(word+ \var{cset-sre} \ldots)} matches a word whose body is 
-one or more word characters matched by the char-set sre \var{cset-sre}.
-It is equivalent to
-\begin{code}
-(word (+ (& (| alphanumeric "_")
-            (| \var{cset-sre} \ldots))))\end{code}%
-%
-For example, a word not containing x, y, or z is
-\begin{code}
-(word+ (~ ("xyz")))\end{code}%
-%
-The regexp \ex{word} matches one word; it is equivalent to 
-\begin{code}
-(word+ any)
-\end{code}%
-
 \note{\ex{bol} and \ex{eol} are not supported by scsh's current 
       regexp search engine, which is Spencer's Posix matcher. This is the only
       element of the notation that is not supported by the current scsh
@@ -1262,9 +1227,6 @@ Note:\begin{itemize}
 \item The string parser doesn't handle the exotica of character class
       names such as \verb|[[:alnum:]]|; the current implementation was written
       in in three hours.
-
-\item The unparser produces Spencer-specific strings for bow/eow
-      elements; otherwise, it's Posix all the way.
 \end{itemize}
 \end{desc}
 
@@ -1327,8 +1289,6 @@ contained in the regular expression.
 \defvarx{re-eos}{regexp}
 \defvarx{re-bol}{regexp}
 \defvarx{re-eol}{regexp}
-\defvarx{re-bow}{regexp}
-\defvarx{re-eow}{regexp}
 \begin{desc}
 These variables are bound to the primitive anchor regexps.
 \end{desc}
@@ -1337,8 +1297,6 @@ These variables are bound to the primitive anchor regexps.
 \defunx{re-eos?}{\object}{\boolean}                             
 \defunx{re-bol?}{\object}{\boolean}
 \defunx{re-eol?}{\object}{\boolean}
-\defunx{re-bow?}{\object}{\boolean}
-\defunx{re-eow?}{\object}{\boolean}
 \begin{desc}
 These predicates recognise the associated primitive anchor regexp.
 \end{desc}
@@ -1378,15 +1336,11 @@ regexps built using other constructors may or may not produce a true value.
 
 %    These are non-primitive predefined regexps of general utility.
 
-\defvar {re-nonl}{regexp}
+\defvarx {re-nonl}{regexp}
-\defvarx{re-word}{regexp}
 \begin{desc}
 The variable \ex{re-nonl} is bound to a regular expression
 that matches any non-newline character
 (corresponding to the SRE \verb|(~ #\newline)|).
-
-Similarly, \ex{re-word} is bound to a regular expression
-that matches any word (corresponding to the SRE \ex{word}).
 \end{desc}
 
 \defun{regexp?}{\object}{\boolean}