I saved my script as posted to "/tmp/j.pl", and ran it as follows: 
echo acegt | /tmp/j.pl

[download]
The output was: 
- bad content: e

[download]
Did you find some other way to run it that yields different results?

In reply to Re^3: =~ matches non-existent symbols by graff
in thread =~ matches non-existent symbols by Anonymous Monk

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