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])
a matrix of character strings. The strings where to
search occurrences of searchStr.
a character string. The string to search in
string_in.
a character string. The replacement string.
a matrix of character strings. The result of the
substitution on searchStr by
replaceStr in string_in.
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.