patch 9.0.0407: matchstr() does match column offset
Problem: matchstr() does match column offset. (Yasuhiro Matsumoto)
Solution: Accept line number zero. (closes #10938)
diff --git a/src/regexp_bt.c b/src/regexp_bt.c
index cf484e0..e3e7a18 100644
--- a/src/regexp_bt.c
+++ b/src/regexp_bt.c
@@ -3444,7 +3444,7 @@
linenr_T lnum = rex.reg_firstlnum + rex.lnum;
long_u vcol = 0;
- if (lnum > 0 && lnum <= wp->w_buffer->b_ml.ml_line_count)
+ if (lnum >= 0 && lnum <= wp->w_buffer->b_ml.ml_line_count)
vcol = (long_u)win_linetabsize(wp, lnum, rex.line,
(colnr_T)(rex.input - rex.line));
if (!re_num_cmp(vcol + 1, scan))