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@ 2014-06-20T20:02:11Z

<?php

if ( preg_match('/-?[\d]*\.?[\d]*/',   "xxxx") ) {
  echo "OK: matches";
} else {
  echo "Bad: doesn't match";
  exit();
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

53.88 ms | 402 KiB | 5 Q