Regex.replaceEval

Replaces occurrences of the pattern in regex with the output of eval for that occurrence.

Setting start_position differs from just passing over a shortened string and setting G_REGEX_MATCH_NOTBOL in the case of a pattern that begins with any kind of lookbehind assertion, such as "\b".

The following example uses [glib.regex.Regex.replaceEval] to replace multiple strings at once:

static gboolean
eval_cb (const GMatchInfo *info,
        GString          *res,
        gpointer          data)
{
 gchar *match;
 gchar *r;

  match = g_match_info_fetch (info, 0);
  r = g_hash_table_lookup ((GHashTable *)data, match);
  g_string_append (res, r);
  g_free (match);

  return FALSE;
}

...

GRegex *reg;
GHashTable *h;
gchar *res;

h = g_hash_table_new (g_str_hash, g_str_equal);

g_hash_table_insert (h, "1", "ONE");
g_hash_table_insert (h, "2", "TWO");
g_hash_table_insert (h, "3", "THREE");
g_hash_table_insert (h, "4", "FOUR");

reg = g_regex_new ("1|2|3|4", G_REGEX_DEFAULT, G_REGEX_MATCH_DEFAULT, NULL);
res = g_regex_replace_eval (reg, text, -1, 0, 0, eval_cb, h, NULL);
g_hash_table_destroy (h);

...