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@ 2017-04-14T08:34:46Z

<?php

$input = [
    '<p>test:</p>',
    '<p>test: foo</p>',
    '<p>foo:</p>',
    '<p>: foo</p>',
    '<p>test </p><p>:</p>',
];

foreach ($input as $val) {
    echo(preg_replace('/(<p>)([^<]+?:)(.*)/', '$1<strong>$2</strong>$3', $val));
    echo("\n");
}

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

110.3 ms | 2688 KiB | 5 Q