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Editorial Team
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Asked: 2026-06-18T02:38:43+00:00

I have some text that ends with a [br] tag, optionally followed by more

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I have some text that ends with a [br] tag, optionally followed by more [br] tags and/or whitespace characters, but nothing else. For example:

bla blah d [br] fkjd fkdh fkd fks
sdkf skdfh djfh[br]
[br]
[br]

I would like to insert text before that [br] tag, like this:

bla blah d [br] fkjd fkdh fkd fks
sdkf skdfh djfh [INSERTED TEXT][br]
[br]
[br]

My problem is, I don’t know how many additional [br] tags or whitespace characters there will be.

Is there an easy way to do this in PHP?

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1 Answer

  1. Editorial Team

    What about something with preg_replace? 

    preg_replace('!\[br\](\s+\[br\])+!i', 'INSERT$0', $subject);

    The regex is looking for a [br] tag, followed optionally by some amount of whitespace, and further [br] tags. There can be any number of following [br] tags. The i at the end indicates case insensitivity.

    You can view this running on codepad

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