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patch 8.0.0645: no error for illegal back reference in NFA engine

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Problem:    The new regexp engine does not give an error for using a back
            reference where it is not allowed. (Dominique Pelle)
Solution:   Check the back reference like the old engine. (closes #1774)
This commit is contained in:
Bram Moolenaar
2017-06-17 20:08:20 +02:00
parent 5b1affefd0
commit 1ef9bbe215
6 changed files with 53 additions and 23 deletions
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10
src/regexp_nfa.c
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@@ -1446,8 +1446,14 @@ nfa_regatom(void)
case Magic('7'):
case Magic('8'):
case Magic('9'):
EMIT(NFA_BACKREF1 + (no_Magic(c) - '1'));
nfa_has_backref = TRUE;
{
int refnum = no_Magic(c) - '1';
if (!seen_endbrace(refnum + 1))
return FAIL;
EMIT(NFA_BACKREF1 + refnum);
nfa_has_backref = TRUE;
}
break;
case Magic('z'):