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Parsing header lines of an email message

Q

How write a regular expression to capture all header lines from an email message like this:

✍: Guest

A

Here is the regular expression to parse all header lines line from emails to:

The multiple lines "m" modifier should be used here:

Click the button to test this regular expression here online:

2013-02-01, 0👍, 0💬

Example General Resource Tools