Method
GLibRegexreplace_eval
since: 2.14
Declaration
gchar*
g_regex_replace_eval (
const GRegex* regex,
const gchar* string,
gssize string_len,
gint start_position,
GRegexMatchFlags match_options,
GRegexEvalCallback eval,
gpointer user_data,
GError** error
)
Description
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 g_regex_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);
...
Available since: 2.14
Parameters
string-
Type: An array of
gcharString to perform matches against.
The length of the array is specified in the string_lenargument.The data is owned by the caller of the function. Each element is a NUL terminated UTF-8 string. string_len-
Type:
gssizeThe length of
string, in bytes, or -1 ifstringis nul-terminated. start_position-
Type:
gintStarting index of the string to match, in bytes.
match_options-
Type:
GRegexMatchFlagsOptions for the match.
eval-
Type:
GRegexEvalCallbackA function to call for each match.
user_data-
Type:
gpointerUser data to pass to the function.
The argument can be NULL.The data is owned by the caller of the function. error-
Type:
GError **The return location for a recoverable error.
The argument can be NULL.If the return location is not NULL, then you must initialize it to aNULLGError*.The argument will left initialized to NULLby the method if there are no errors.In case of error, the argument will be set to a newly allocated GError; the caller will take ownership of the data, and be responsible for freeing it.