Simple Regex that matches most emails

Useful for Visual Code Studio (Show Functions extension)

Simple lookbehind - only selects what is after the @ IF what comes before is NOT 'jeffery' From this guys video https://www.youtube.com/watch?v=aIEjh0YsxWA&t=1s

Simple Positive Lookbehind - only selects what is after the @ IF what comes before IS 'jeffery' Based on this (awesome) guys https://youtu.be/aIEjh0YsxWA?t=228

Simple positive Lookahead - Select 'box' only if what comes after is '-shadow' See this youtube https://youtu.be/aIEjh0YsxWA?t=228

Selects box only if what comes after is NOT -shadow

Extracts "example" from URLs like "http://www.example.com"

Get tokenized document number

RegEx case2

Search text for any URL, including numerical IPs and greater than 3 char domain extensions. Also searches for http(s) alone, include with a third slash, as I ran into scumbag Russian spammers who were doing this.

HTTP ETag header match (RFC7232) HTTP ETag RFC specification: https://tools.ietf.org/html/rfc7232#section-2.3