Regular Expressions(REG-EX)

 

Reg -ex for  finding a pattern of digits which might resemble a telephone number in a format :

XXX-XXX-XXXX  OR  YYY.YYY.YYYY

\d{3}[.,-]\d{3}[.,-]\d{4}

Regex for some string ending with something for .eg here 1

.*1$

Regex for some string starting with something,  for .eg here 2

^2.*

Regex for some string containing  something,  for .eg here test

.*test

One of the many web-sites for testing reg-ex  is :

https://regex101.com/