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@ 2015-02-19T23:35:58Z

<?php

$address = "Flat 2 House Name 21 Another Road";

echo preg_match('/(Flat\s\d+) (\w+)(\s\d+)/i', $address) . PHP_EOL;

$address = preg_replace('/(Flat\s\d+) (\w+)(\s\d+)/i', '\\1, \\2, \\3', $address);

echo $address;

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

38.16 ms | 402 KiB | 5 Q