Regex.checkReplacement

Checks whether replacement is a valid replacement string (see [glib.regex.Regex.replace]), i.e. that all escape sequences in it are valid.

If has_references is not null then replacement is checked for pattern references. For instance, replacement text 'foo\n' does not contain references and may be evaluated without information about actual match, but '\0\1' (whole match followed by first subpattern) requires valid #GMatchInfo object.