Include RE2 library

third_party/re2/doc/mksyntaxwiki

Index: third_party/re2/doc/mksyntaxwiki
diff --git a/third_party/re2/doc/mksyntaxwiki b/third_party/re2/doc/mksyntaxwiki
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+#!/bin/sh
+
+cp syntax.txt syntax.wiki
+sam -d syntax.wiki <<'!'
+,s!`!`````!g
+,s!== (([^()]|\([^()]*\))*)!≡ `\1`!g
+,s!«!`!g
+,s!»!`!g
+,s! vim$! <font size="1">VIM</font>!g
+,s! pcre$! <font size="1">PCRE</font>!g
+,s! perl$! <font size="1">PERL</font>!g
+,s!(^[^	]+)	(.*)\n!`\1`	\2\n!g
+,x g/NOT SUPPORTED/ s!^[^	]+!<font color="#808080">&</font>!
+,s!NOT SUPPORTED!<font size="1">(&)</font>!g
+,s!(^[^	]+)	(.*)\n!<tr><td>\1</td><td>\2</td></tr>\n!g
+,s!.*:$!<b>&</b>!g
+,s!^$!<tr><td></td></tr>!g
+,x v/<tr>/ s!.*!<tr><td colspan="2">&</td></tr>!
+1,2c
+#summary I define UNIX as “30 definitions of regular expressions living under one roof.” —Don Knuth
+
+<wiki:comment>
+GENERATED BY mksyntaxwiki.  DO NOT EDIT
+</wiki:comment>
+
+<table border="0" cellpadding="2" cellspacing="2">
+<tr><td colspan="2">This page lists the regular expression syntax accepted by RE2.</td></tr>
+<tr><td colspan="2">It also lists syntax accepted by PCRE, PERL, and VIM.</td></tr>
+<tr><td colspan="2">Grayed out expressions are not supported by RE2.</td></tr>
+.
+$a
+</table>
+.
+w
+q
+!