Regular expression matching on text.
System.regex.match_result: Regular expression result object.make System.regex(regex): Construct new regular expression object.make System.regex(regex, c_insensitive): Construct new regular expression object.case_insensitive: Is match case-insensitive?internal_regex_obj: match(str): Match regular expression on text.match(str, start): Match regular expression on text.replace(str, replace_with): Replaces string matched by regular expression with another.replace(str, replace_with, max): Replaces string matched by regular expression with another.split(str): Splits a string based on regular expression.split(str, max): Splits a string based on regular expression.