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![**REGEX CHEATSHEET**
**Pattern Modifiers**
- `g` global match
- `i` case-insensitive
- `m` treat string as multiple lines
- `s` treat string as single line
- `x` allow comments and white space in pattern
- `e` evaluate replacement
**Predefined Character Classes**
- `.` matches any character
- `\d` a digit, `[0-9]`
- `\D` a non-digit, `[^0-9]`
- `\s` a whitespace character, `[ \t\n\x0B\f\r]`
- `\S` a non-whitespace character, `[^s]`
- `\w` a word character, `[a-zA-Z_0-9]`
- `\W` a non-word character, `[^w]`
- `\A` start of string
- `\Z` end of input, but for final terminator, if any
- `\z` end of input
- `\b` word boundary
- `\B` non-word boundary
- `\G` end of previous match
**Assertions**
- `?=` lookahead
- `?!` negative lookahead
- `?=` or `?<=` lookbeh](https://pisces.bbystatic.com/image2/BestBuy_US/images/products/20d794ca-5b20-405d-acc1-f8d6fab49dc9.jpg;maxHeight=427;maxWidth=640?format=webp)
![radioshack
1 2 3 4 5 6 7 8 9 0 - = \ Enter
Q W E R T Y U I O P [ ] \
A S D F G H J K L ; '
Z X C V B N M , . / Shift
Caps Lock
Shift
Ctrl
Alt
Alt
Fn
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12
Esc
Insert Delete Home End Page Up Page Down
radioshack
Lock
Q W S L D R F T G Y H u J K O L P
1 2 3 4 5 6 7 8 9 0 - = \ Enter
A S D F G H J K L ; '
Z X C V B N M , . / Shift
Caps Lock
Shift
Ctrl
Alt
Alt
Fn
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12
Esc
Insert Delete Home End Page Up Page Down
radioshack
Lock
Q W S L D R F T G Y H](https://pisces.bbystatic.com/image2/BestBuy_US/images/products/39e19c52-1099-4e7f-aaaa-3f5ffb05bac9.png;maxHeight=427;maxWidth=640?format=webp)
