regex starts with a character and ends with a character extract code example

Example 1: regex ends with string

$ is used to match the end of the string. and can be used like

"string"$
like

xyz$
if you want to end with xzy

Example 2: regex start string

Start of String or Line: ^ 
By default, the ^ anchor specifies that the following pattern must begin 
at the first character position of the string.