This is a regular expression for date in javascript. It validates the month between 01-12 (double digits only). It validates the day between 01-31 (double digits only). And enforces 4 digit year (no validation for range).

matching words between square brachets tags include newline or carriage return

Look for a group of consonants with 3 or more in succession.

10 digits

email that accepts the plus (+) symbol

Convert Arrow Function to Normal Function

Test for Password using any character. Length of password can be from 8 - 63 characters

Extracts values of the form £nnn,nnn.nn or $nnn.nnn from text

this regular expression allow numbers with one number from 1 to 5 and only one decimal value Onlys accept numeric values from 1.0 to 5

Selects Xml version and Encoding and whitespaces

Matches HTML structure

To identify quoted strings, single terms as well as subtracting those types. Based on: http://stackoverflow.com/questions/1883188/google-like-search-query-tokenization-string-splitting

For use in testing SpellChecker(MHApps)