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libregexp: fix lexer so it doesnt move past the string when it gets a \ escape

--- a/sys/src/libregexp/regcomp.c

+++ b/sys/src/libregexp/regcomp.c

@@ -312,13 +312,10 @@

 		return;

 	}

 	l->rawexp += chartorune(&l->rune, l->rawexp);

-	if(l->rune == L'\\') {

-		l->rawexp += chartorune(&l->rune, l->rawexp);

-		l->literal = 1;

-	}

 	if(*l->rawexp == 0)

 		l->done = 1;

-	return;

+	if(l->rune == L'\\')

+		getnextrlit(l);

 }

 static void

@@ -333,7 +330,6 @@

 	l->rawexp += chartorune(&l->rune, l->rawexp);

 	if(*l->rawexp == 0)

 		l->done = 1;

-	return;

 }

 static int

-- 

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