[NAME] ALL.dao.type.string.pattern.change [TITLE] string.change() [DESCRIPTION] 1 string.change( pt :string, s :string, index=0, start=0, end=0 ) => int Replace the substrings that match to pt with string s, which may contain reference to captured subtrings for groups, for example, if s = 'abc%1', it means replacing with a string which is a concatenation of abc and the substring that match to the first group of pt. If index is positive, replace the index-th occurrence of the substring matching to pt. The substitution can also be restricted within a region starting from position start until position end. The number of occurrence of substitution is returned.