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Editorial Team
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Asked: 2026-05-26T12:26:20+00:00

I am trying to use regex in Java to extract contents out of a

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I am trying to use regex in Java to extract contents out of a multiline string that is between 2 tags. For example, the content may look like this:

--_000_CAKETFEgg78oKKJPNySnxF4BgQoh9ifHP4XzXGeJddUvOtz5wmailgm_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

hello test

...

..
!@#!@%$#^%$&*^(*)*()
..
..
..



..


--_000_CAKETFEgg78oKKJPNySnxF4BgQoh9ifHP4XzXGeJddUvOtz5wmailgm_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

hello test<br><br>..<br>!@#!@%$#^%$&*^(*)*()<br>.<br><br>.<br>.<br>.<br><br><br><br>.<br><br>

--_000_CAKETFEgg78oKKJPNySnxF4BgQoh9ifHP4XzXGeJddUvOtz5wmailgm_

I want to extract just the contents between the --_000_CAKETFEgg78oKKJPNySnxF4BgQoh9ifHP4XzXGeJddUvOtz5wmailgm_ boundaries.

I used a regular expression that looks like this: --_000_CAKETFEgg78oKKJPNySnxF4BgQoh9ifHP4XzXGeJddUvOtz5wmailgm_\n?[.\n]+\n?--_000_CAKETFEgg78oKKJPNySnxF4BgQoh9ifHP4XzXGeJddUvOtz5wmailgm_

But it doesn’t work. What should my regular expression be to extract the content? Also, when extracting, would the boundary tags be included together with the content?

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1 Answer

  1. Editorial Team

    I would highly recommend not to use regular expressions for parsing. They are not well suited for that. Just write a parser that iterates over your input, searches for the start tag, sets a flag, records all following lines, recognizes the end tag and resets the flag. Easily done and much more flexible than regex.

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