[gtksourceview] implregex: track the number of subpatterns

[Christian Hergert <chergert src gnome org>]

commit 92ff797bff1eb5130e2d3c53e199d3569eebd4e9
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jul 2 14:29:45 2021 -0700

    implregex: track the number of subpatterns
    
    This comes from GRegex and will be used later on.

 gtksourceview/implregex.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gtksourceview/implregex.c b/gtksourceview/implregex.c
index d018ea07..273e8af7 100644
--- a/gtksourceview/implregex.c
+++ b/gtksourceview/implregex.c
@@ -75,6 +75,7 @@ struct _ImplMatchInfo
        pcre2_match_data *match_data;
        PCRE2_SIZE       *offsets;
        int               matches;
+       PCRE2_SIZE        n_subpatterns;
        gssize            start_pos;
 };
 
@@ -297,6 +298,8 @@ impl_match_info_new (ImplRegex        *regex,
        match_info->string_len = string_len;
        match_info->match_data = pcre2_match_data_create_from_pattern (regex->code, NULL);
 
+       pcre2_pattern_info (regex->code, PCRE2_INFO_CAPTURECOUNT, &match_info->n_subpatterns);
+
        if (match_info->match_data == NULL)
        {
                g_error ("Failed to allocate match data");