regex module Contains rules for string processing using regular expressions. "x*" matches the pattern "x" zero or more times. "x+" matches "x" one or more times. "x?" matches "x" zero or one time. "[abcd]" matches any of the characters, "a", "b", "c", and "d". A character range such as "[a-z]" matches any character between "a" and "z". "[^abc]" matches any character which is not "a", "b", or "c". "x|y" matches either pattern "x" or pattern "y" (x) matches "x" and captures it. "^" matches the beginning of the string. "$" matches the end of the string. "\<" matches the beginning of a word. "\>" matches the end of a word. split regex rule split ( string separator ) Returns a list of the following substrings: from beginning till the first occurrence of separator or till the end, between each occurrence of separator and the next occurrence, from the last occurrence of separator till the end. If no separator is present, the result will contain only one element. split-list regex rule split-list ( list * : separator ) Returns the concatenated results of applying regex.split to every element of the list using the separator pattern. match regex rule match ( pattern : string : indices * ) Match string against pattern, and return the elements indicated by indices. transform regex rule transform ( list * : pattern : indices * ) Matches all elements of list against the pattern and returns a list of elements indicated by indices of all successful matches. If indices is omitted returns a list of first parenthesized groups of all successful matches. escape regex rule escape ( string : symbols : escape-symbol ) Escapes all of the characters in symbols using the escape symbol escape-symbol for the given string, and returns the escaped string. replace regex rule replace ( string match replacement ) Replaces occurrences of a match string in a given string and returns the new string. The match string can be a regex expression. replace-list regex rule replace-list ( list * : match : replacement ) Replaces occurrences of a match string in a given list of strings and returns a list of new strings. The match string can be a regex expression. See also: MATCH