Improve NEWLINE pattern
#463
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Old one could fail depending on previous matching activity, possibly because of the use of \G (which I should have explained better in a comment, back when I thought I knew why I was doing it). The documented behavior of ^ $ and \z and reluctant quantifiers make for a simpler and more dependable version. Addresses issue #455.
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Supply a
NEWLINEpattern insqlgen.Lexicalsthat still meets the goal of relying on Java's regex engine for precisely what is or isn't a newline, but without the ill-thought-out sensitivity to the previous match result reported in issue #455.