strsubst substitute a character string by another in a character string string_out = strsubst(string_in, searchStr, replaceStr) string_out = strsubst(string_in, searchStr, replaceStr, [flag]) string_in a matrix of character strings. The strings where to search occurrences of searchStr. searchStr a character string. The string to search in string_in. replaceStr a character string. The replacement string. string_out a matrix of character strings. The result of the substitution on searchStr by replaceStr in string_in. flag a character ("r" for regular expression). The strsubst function replaces all occurrences of searchStr in string_in by replaceStr. When using the forth parameter "r", the searchStr should be a string of regular expression. And then strsubst is going to match it with string_in and replace according to the regular expression rules. string strings