How can I match within a MIME header substring using Regex, matching the last occurrence of a closing string to an opening string

Asked Nov 16 '22 at 17:53

Active Nov 16 '22 at 17:53

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I have a string that I'm trying to extract information from…

Subject: =?iso-8859-1?Q?=A1=F1?= text =?iso-8859-1?B?KJLHDHmnflkjheJKLJVC=?=

I want my regex to extract…

=?iso-8859-1?Q?=A1=F1?= and =?iso-8859-1?B?KJLHDHmnflkjheJKLJVC=?=

The Regex I have at the moment…

I've written the following Regex - which is nearly, but not quite, right…

=\?(.*?)\?=

The problem

The problem is that this extracts the following…

=?iso-8859-1?Q?= and =?iso-8859-1?B?KJLHDHmnflkjheJKLJVC=?=

As you can see, the Regex is confused by the ?= following Q - despite the fact that this is not the last occurrence of this string after the initial opening =?.

Does anyone have any idea on how I can fix this?

asked Nov 16 '22 at 17:53

headbanger

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Use `=\?(.*?)\?=(?!\S)` – Wiktor Stribiżew Nov 16 '22 at 17:54
If this wasn't closed then you'd get a correct answer for this. Thank you so much! – headbanger Nov 16 '22 at 18:01
These "word" boundary type question are too frequent, no need for another answer. – Wiktor Stribiżew Nov 16 '22 at 18:02

How can I match within a MIME header substring using Regex, matching the last occurrence of a closing string to an opening string

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