Use regexp in .BAT to find substring

Question

How can I check contains of substring in string variable of batch file?

for example:

set var1=foobarfoo

set regexp=.*bar.*

if [check var1 by regexp] echo "YES"

In my case, it's must be only check by regular expression and only in .bat file.

Answer 1

Adjusting the answer found here give

@echo off
set var1=foobarfoo
set "regexp=.*bar.*"
echo %var1%
echo %regexp%
setlocal enableDelayedExpansion
echo(%var1%|findstr /r /c:"%regexp%" >nul && (
    echo FOUND
    rem any commands can go here
) || (
    echo NOT FOUND
    rem any commands can go here
)