bash - How can I grep complex strings in variables? -

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i trying grep small string in larger string. both strings being stored variables , here code example: 

#!/bin/bash  long_str=$(man man) shrt_str="guide"  if grep -q $shrt_str $long_str ;         echo "found it!" fi

i don't think variable expansion working way expect to. have tried [ ] , [[ ]], quoting variables , piping output /dev/null no matter won't work.

does have ideas?

echo "$long_str" | grep -q "$shrt_str" if [ $? -eq 0 ];then   echo "found" fi

or

echo "$long_str" | grep  -q  "$shrt_str"  && echo "found" || echo "not found"

but since using bash shell, use shell internals. no need call external commands

shrt_str="guide" case "$long_str" in     *"$shrt_str"* ) echo "found";;    * ) echo "not found";; esac

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