scan

scans a string for regular expression matches and extracts groups

(string subject, string pattern) -> list

Returns a list of matches and captured groups for each successive match of regular expression pattern in subject

Each match generates a list with the following properties: Index 0 contains the matched input string, and subsequent indexes contain any matched capturing groups. Group indexes correspond to the sequence of opening group parentheses of capturing groups in the pattern. If a group is optional, and is not matched by the input string, its value in the list is nil

If a capturing group is inside a quantifier, only the last matched string is captured.

Returns an empty list in case there are no matches of pattern in subject

Returns nil if any argument is nil

Parameters