[re] Replace \colcol with :: and remove extraneous whitespace. (#1358)

Author: cpplearner

source/regex.tex

@@ -1118,7 +1118,7 @@
 \pnum\effects If \tcode{typeid(use_facet<collate<charT>>)
 == typeid(collate_byname<charT>)}
 and the form of the sort key returned
-by \tcode{collate_byname<charT> \colcol transform(first, last)} is known and
+by \tcode{collate_byname<charT>::transform(first, last)} is known and
 can be converted into a primary sort key then returns that key,
 otherwise returns an empty string.
 \end{itemdescr}
@@ -3640,7 +3640,7 @@
 \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::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}.
@@ -4163,8 +4163,8 @@
 \item During matching of a regular expression finite state machine
 against a sequence of characters, comparison of a collating element
 range \tcode{c1-c2} against a character \tcode{c} is
-conducted as follows: if \tcode{flags() \& regex_constants \colcol
-collate} is false then the character \tcode{c} is matched if \tcode{c1
+conducted as follows: if \tcode{flags() \& regex_constants::collate}
+is false then the character \tcode{c} is matched if \tcode{c1
 <= c \&\& c <= c2}, otherwise \tcode{c} is matched in
 accordance with the following algorithm: