Lesson Notes from http://regexone.com/
| Regex | Are |
|---|---|
| abc… | Letters |
| 123… | Digits |
| \d | Any Digit |
| \D | Any Non-digit character |
| . | Any Character |
| \. | Period |
| [abc] | Only a, b, or c |
| [^abc] | Not a, b, nor c |
| [a-z] | Characters a to z |
| [0-9] | Numbers 0 to 9 |
| \w | Any Alphanumeric character |
| \W | Any Non-alphanumeric character |
| {m} | m Repetitions |
| {m,n} | m to n Repetitions |
| * | Zero or more repetitions |
| + | One or more repetitions |
| ? | Optional character |
| \s | Any Whitespace |
| \S | Any Non-whitespace character |
| ^…$ | Starts and ends |
| (…) | Capture Group |
| (a(bc)) | Capture Sub-group |
| (.*) | Capture all |