How to check if a file name matches regex in shell script
<p>I have a shell script that needs to check if a file name matches a certain regex, but it always shows "not match".  Can anyone let me know what's wrong with my code?</p>

<pre><code>fileNamePattern=abcd_????_def_*.txt
realFilePath=/data/file/abcd_12bd_def_ghijk.txt

if [[ $realFilePath =~ $fileNamePattern ]]
then
    echo $realFilePath match  $fileNamePattern
else
    echo $realFilePath not match $fileNamePattern
fi
</code></pre>