Regular Expressions is a sequence of characters that defines a search pattern for text
| Meta Character | WTF is it ? |
|---|---|
| \d | any digit that can be from 0-9 |
| \w | A-Z a-z 0-9 ( alphanumeric and underscore) |
| \W | other than A-Z a-z 0-9 |
| \s | white space |
| \S | other than whitespace |
| . | any character whatsoever |
| * | 0 or more |
| .* | wildcard (matches anything) |
| Quantifier | WTF is it? |
|---|---|
| * | 0 or more |
| + | one or more ( atleast one) |
| ? | 0 or one ( optional) |
| {min,max} | Min, max |
| {n} | n characters |
| Position | WTF is it? |
|---|---|
| ^ | begining |
| $ | end |
| \b | word boundary |
| \B | not a word boundary |