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Editorial Team
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Asked: 2026-05-23T05:04:57+00:00

In a C# class, I came across this regular expression: <?>?=?\d{4} It is pretty

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In a C# class, I came across this regular expression:

<?>?=?\d{4}

It is pretty obvious that its last part (\d{4}) matches 4 decimal digits but what about <?>?=?? What does it match?

Thanks for any explanations.

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1 Answer

  1. Editorial Team

    Four digits at the end preceded by the < , > and = occurring zero or once in that order.

    Match:

    <>=1234
>=1234
=1234
1234
<=1234
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