replace_eval

Description:

public string replace_eval (string str, ssize_t string_len, int start_position, RegexMatchFlags match_options, RegexEvalCallback eval) throws RegexError

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 replace_eval 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);

...

Parameters:

this	a Regex structure from Regex
string_len	the length of `string`, in bytes, or -1 if `string` is nul-terminated
start_position	starting index of the string to match, in bytes
match_options	options for the match
eval	a function to call for each match
string	string to perform matches against
user_data	user data to pass to the function

Returns:

a newly allocated string containing the replacements