Regex implementation

[CTRLRLTY]

The regex operator for the match section should not use the underlying default REGEXP from sqlite3.

Create a custom regex parser with limited features and without backreferences.

List of things the regex parser should support:

Symbol	Description
\	escape meta character
^	match from beginning or negate a character in bracket expression
.	match any single character except newline
|	alternation
()	grouping
[]	bracket expression
*	matches zero or more characters
+	matches one or more characters
?	matches zero or one character
{count}	matches exactly count occurrences of the preceding regular expression
{min,}	matches min or more occurrences of the preceding regular expression
{min, max}	matches at least min but no more than max occurrences of the preceding regular expression
*?	non greedy *
+?	non greedy +
??	non greedy ??
{count}?	non greedy {count}
{min,}?	non greedy {min,}
{min, max}?	non greedy {min, max}
\t	tab
\n	newline
\r	carriage return
\f	form feed