- Three metacharacters that are required to learn:
* = Preceding item , zero or more times.+ = Preceding item, one or more times? = Preceding item, zero or one time.
- All three go after something in a regex.
- Common regex:
/.+/ matches any string of characters, except a line return.
- An example is
/Good .+\./ matches “Good morning”, “Good day.”, “Good evening.” and “Good night.”
/\d+/ matches “90210”/\s[a-z]+ed\s/ matches lowercase words ending in “ed”./\s[a-z]+ed\s/ matches lowercase words ending in “ed”/apples*/ matches “apple”, “apples” and “applesssssss”/apples+/ matches “apples” and “applesssssss”, but not “apple”/apples?/ matches “apple” and “apples”, but not “applesssssss”/\d\d\d\d*/ matches numbers with three digits or more./\d\d\d+/ matches numbers with three digits or more./colou?r/ matches “colour” and “colour”.