How to test that a variable starts with a string in bash?

[tamalsaha]

[['s = operator takes a pattern in the right operand.

• https://stackoverflow.com/a/4132551/244009
• https://stackoverflow.com/a/2172367/244009
• https://stackoverflow.com/a/31710142/244009
• http://dev-maziarz.blogspot.com/2018/01/bash-how-to-check-if-string-starts-with.html
• https://linuxize.com/post/how-to-check-if-string-contains-substring-in-bash/