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Editorial Team
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Asked: 2026-05-14T08:21:43+00:00

I have the following data: a b c d FROM:<uniquepattern1> e f g h

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I have the following data:

a b c d FROM:<uniquepattern1>
e f g h TO:<uniquepattern2>
i j k l FROM:<uniquepattern1>
m n o p TO:<uniquepattern3>
q r s t FROM:<uniquepattern4>
u v w x TO:<uniquepattern5>

I would like a regex query that can find the contents of TO: when FROM:<uniquepattern1> is encountered, so the results would be uniquepattern2 and uniquepattern3.

I am hopeless with regex, I would appreciate any pointers on how to write this (lookahead parameters?) and any differences between regex on different platforms (eg the C# .NET Regex versus Grep vs Perl) that might be relevant here.

Thank you.

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1 Answer

  1. Editorial Team

    Try:

    /FROM:<uniquepattern1>.*\r?\n.*?TO:<(.*?)>/

    This works by first finding the FROM anchor and then use a dot wildcard. The dot operator does not match a newline so this will consume the rest of the line. A non-greedy dot wildcard match then consumes up to the next TO and captures what’s between the angle brackets.

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