[expr, re] Replace maths pipes with code pipes

Author: tkoeppe

source/expressions.tex

@@ -4453,15 +4453,15 @@
 \begin{bnf}
 \nontermdef{logical-or-expression}\br
     logical-and-expression\br
-    logical-or-expression \terminal{$||$} logical-and-expression
+    logical-or-expression \terminal{||} logical-and-expression
 \end{bnf}
 
 \pnum
-The \tcode{$||$} operator groups left-to-right. The operands are both
+The \tcode{||} operator groups left-to-right. The operands are both
 contextually converted to \tcode{bool}
 (Clause~\ref{conv}). It returns
 \tcode{true} if either of its operands is \tcode{true}, and
-\tcode{false} otherwise. Unlike \tcode{$|$}, \tcode{$||$} guarantees
+\tcode{false} otherwise. Unlike \tcode{|}, \tcode{||} guarantees
 left-to-right evaluation; moreover, the second operand is not evaluated
 if the first operand evaluates to \tcode{true}.
 

source/regex.tex

@@ -3719,16 +3719,19 @@
 \pnum
 \indexlibrary{\idxcode{match_not_null}}%
 \indexlibrary{\idxcode{match_continuous}}%
-Otherwise, if the iterator holds a zero-length match the operator calls
-\tcode{regex_search(start, end, match, *pregex, flags $|$ regex_constants::match_not_null
-$|$ regex_constants::match_}\\\tcode{continuous)}. If the call returns \tcode{true} the operator
+Otherwise, if the iterator holds a zero-length match, the operator calls:
+\begin{codeblock}
+regex_search(start, end, match, *pregex,
+             flags | regex_constants::match_not_null | regex_constants::match_continuous)
+\end{codeblock}
+If the call returns \tcode{true} the operator
 returns \tcode{*this}. Otherwise the operator increments \tcode{start} and continues as if
 the most recent match was not a zero-length match.
 
 \pnum
 \indexlibrary{\idxcode{match_prev_avail}}%
 If the most recent match was not a zero-length match, the operator sets
-\tcode{flags} to \tcode{flags $|$ regex_constants \colcol match_prev_avail} and
+\tcode{flags} to \tcode{flags | regex_constants \colcol match_prev_avail} and
 calls \tcode{regex_search(start, end, match, *pregex, flags)}. If the call returns
 \tcode{false} the iterator sets \tcode{*this} to the end-of-sequence iterator. The
 iterator then returns \tcode{*this}.