Make string match -rnv work

Fixes #3098.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/builtin_string.cpp b/src/builtin_string.cpp
index edb6320f..a2ac0244 100644
--- a/src/builtin_string.cpp
+++ b/src/builtin_string.cpp
@@ -376,8 +376,12 @@ class pcre2_matcher_t : public string_matcher_t {
         // Return values: -1 = error, 0 = no match, 1 = match.
         if (pcre2_rc == PCRE2_ERROR_NOMATCH) {
             if (opts.invert_match && !opts.quiet) {
-                streams.out.append(arg);
-                streams.out.push_back(L'\n');
+                if (opts.index) {
+                    streams.out.append_format(L"1 %lu\n", wcslen(arg));
+                } else {
+                    streams.out.append(arg);
+                    streams.out.push_back(L'\n');
+                }
             }
 
             return opts.invert_match ? 1 : 0;