PHP regex – match any digit

Php regex can use digit shorthand (\d) to match a digit (0-9). To match any non digit character, regex shorthand \D (uppercase backslash D) can be used.

\d Any digit (0-9)
\D Any character other than 0-9

preg_match – check if a string contains only digit characters

<?php
if (preg_match('/^\d*$/i', "123", $matches, PREG_OFFSET_CAPTURE)) {
  echo "matched string:\n{$matches[0][0]} (at offset {$matches[0][1]})\n";
} else {
  echo "No match\n";
}
?>
matched string:
123 (at offset 0)
Env: PHP version 5.5.9 (Linux)

preg_replace – remove non digit characters from a string

<?php
$str = "Remove non digits 123";
$newstr = preg_replace('/\D/', "", $str, -1, $count);
if ($count > 0) {
  echo "newstr after $count replacement(s):\n$newstr\n";
} else {
  echo "No replacement\n";
}
?>
newstr after 18 replacement(s):
123
Env: PHP version 5.5.9 (Linux)
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