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@ 2015-04-30T12:00:51Z

<?php
$param_string = "CREATED_AT > TO_DATE(:delete_date, 'DD/MM/YYYY HH24:MI:SS') AND";
$regex = '/[^A-Za-z]:\b([^\s:]+)\b[^:]/i';
$repl = '\1';
$param = preg_replace($regex, $repl, $param_string);
print "$param\n";
$param = preg_grep($regex, $param_string);
print "$param\n";

Output
Performance
VLD
References
Branches

preg_grep: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

49.73 ms | 402 KiB | 5 Q