How to subtract a string from value field

[anasshsa]

I Need to know to subtract a string from the begining of a value until a specific character in Spl. For example, if I have a field who contains emails or another data:
MAIL FROM: [email protected] BODY=7BIT
How to get just the email address [email protected]
Thanks for the help.

[richgalloway]

This is very similar to your earlier question, but the example is different and so is the answer. This rex command will put the email address in the emailAddr field.

... | rex field=foo "(?<emailAddr>[^\s]+)" | ...