$re = '/([A-Z]{3})-([A-Z]{3})-([A-Z]{3})/m';
$str = 'Welcome to RegExr v2.0 by gskinner.com!
Edit the Expression & Text to see matches. Roll over matches or the expression for details. Undo mistakes with ctrl-z. Save & Share expressions with friends or the Community. A full Reference & Help is available in the Library, or watch the video Tutorial.
pippo
Sample text for testing:
abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijk.lmn.opqrstuvwxyz ABCD.EFG.HIJKLMN-OPQ-RSTUVWXYZ
0123456789 +-.,!@#$%^&*();\\/|<>"\'
12345 -98.7 3.141 .6180 9,000 +42
555.123.4567 +1-(800)-555-2468
foo@demo.net bar.ba@test.co.uk
www.demo.com http://foo.co.uk/
http://regexr.com/foo.html?q=bar';
$subst = "==> sostituto: $3:$1:$2 ==> originale: **$&**";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php