String

str.contains	Whether the string contains a given pattern or substring.
str.ends_with	Whether the string ends with a given suffix.
str.join	Concatenates all strings in a group to a single string.
str.len	Computes the length of the string.
str.lower	Converts all alphabet letters to lower case.
str.replace_all	Replaces all occurrences of a given substring by a different string.
str.slice	Returns a substring of the input string.
str.starts_with	Whether the string starts with a given prefix.
str.strip	Removes leading and trailing whitespace.
str.to_date
str.to_datetime
str.upper	Converts all alphabet letters to upper case.