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@ 2013-10-23T08:07:45Z

<?php

$exprs = [
    '/[=]/',
    '/[=foo=]/',
    '/[:]/',
    '/[:foo:]/',
    '/[.]/',
    '/[.foo.]/',
];

foreach ($exprs as $expr) {
    preg_match($expr, 'foo');
}

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

29.23 ms | 402 KiB | 5 Q