regex start with and end with code example

Example 1: regex all starting with

#check if word starts with "test"

^test.*$

Example 2: 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 3: 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.