bug#24262: [PATCH 2/2] dfa: support not newline_anchor of regex

[Paul Eggert]

Norihiro Tanaka wrote:
> However, the patch adds an argument to dfasyntax().   To synchronize
> between grep and dfa easily, I expect it is applied before dfa is moved
> to gnulib.

Since we're already changing the DFA API already, how about if we have a flags 
arg that combines all these little Boolean arguments? That will make future 
changes less disruptive. Although the existing code supports any newline 
terminator, in practice only '\0' and '\n' are useful, so it's really just a 
boolean.

Most of the changes in your proposed patch are subsumed by the changes for 
multithreading, so the patch can be simplified now. I installed the attached, 
and plan to follow up shortly about the corresponding Gawk changes that I'll 
propose.

0001-dfa-new-option-for-anchored-searches.patch
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