<?php $sentence = "foo_foo_foo foo-foo_foo"; if (preg_match_all("/(?<![^\W_])foo(?![^\W_])/i", $sentence, $matches)) { print_r($matches[0]); } echo PHP_EOL . preg_replace("/(?<![^\W_])foo(?![^\W_])/i", "YES", $sentence);
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Value for `_results` contains invalid data `array`