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fix e2 production to match regexp(6) and do it right this time

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

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

@@ -78,14 +78,17 @@

 	Renode *n;

 	n = e3(plex);

-	if(lex(plex) == LREP) {

+	while(lex(plex) == LREP) {

 		switch(plex->rune) {

 		case L'*':

-			return node(plex, TSTAR, n, nil);

+			n = node(plex, TSTAR, n, nil);

+			break;

 		case L'+':

-			return node(plex, TPLUS, n, nil);

+			n = node(plex, TPLUS, n, nil);

+			break;

 		case L'?':

-			return node(plex, TQUES, n, nil);

+			n = node(plex, TQUES, n, nil);

+			break;

 		}

 	}

 	plex->peek = 1;

-- 

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