Create validate-email.md

snippets/validate-email.md

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+### Validate Email
+ 
+ Regex is taken from https://stackoverflow.com/questions/46155/how-to-validate-email-address-in-javascript
+ Returns `true` if email is valid, `false` if not.
+ 
+ ```js
+ const validateEmail = str => /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/.test(str);
+ // isemail(mymail@gmail.com) -> true
+ ```
+