While filtering messages I need to run external program and pass e-mail which is extracted from e-mail body.

I have created filter to run external program and entered command line below, unfortunatelly macros always return empty string. What is wrong?

Run external command
MyProgram.exe "%REGEXPTEXT="(?is)(.*?)E-Mail (.*?)\n""

My e-mail body from which e-mail should be extracted

<text skipped>
E-Mail              = my@e-mail.com
<text skipped>

Thank You for help
Tomas