How can I match a string with a regex in Bash?

Question

I am trying to write a bash script that contains a function so when given a .tar, .tar.bz2, .tar.gz etc. file it uses tar with the rel

Answer 1

if [[ $STR == *pattern* ]]
then
    echo "It is the string!"
else
    echo "It's not him!"
fi

Works for me! GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu)