bug#19306: [PATCH 1/2] dfa: avoid execution for a pattern including an unsupported expression

[Norihiro Tanaka]

If a pattern includes an unsupported expression which is labeled as
BACKREF, a text will almost fail to match the pattern.

First patch makes changes to return immediately and avoid pidding search
if a pattern includes an unsupported expression.

Second patch removes word constraint support which is as labeled BEGWORD,
ENDWORD, LIMWORD and NOTLIMWORD for multibyte-locales including UTF-8
from DFA, as we use regex instead of DFA for a pattern including word
constraint so that it does not correctly treat word constraint.

0001-dfa-avoid-execution-for-a-pattern-including-an-unsup.patch
Description: Text document

0002-dfa-remove-a-support-of-a-word-delimiter-expression-.patch
Description: Text document