Add regex cheatsheet

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+### Regex (Regular Expressions) aka regexp
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+Used for searching for specialized/certain patterns to manipulate or gather text/data and is not a standalone product but some part of a program/utility. Many scripting languages have a use for it but is not limited to the aforementioned, example: grep, vim, etc..
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+[ -~]
+It matches all ASCII characters from the space to tilde