preg_match

[amrigo]

Hi
I need to find if the user has typed numbers in a text field :
preg_match is the best choice?

how it can be used?
preg_match("/([0-9])" $match) )
Thank´s in advance

[laserlight]

If the ctype functions are available (and they usually are), you can use [man]ctype_digit/man.

For a PCRE regex:
/^\d+$/
where \d is equivalent to [0-9]

[amrigo]

the manual for ctype_digit says :

Returns TRUE if every character in text is a decimal digit, FALSE otherwise.

When i would like to check if the numbers are between letters i can use preg_match as the best choice?

[amrigo]

/^\d+$/

d stand for decimal?

[laserlight]

In this case, it becomes a question of "is there a numeral in this string?"
So yes, regex is probably a better way.
The pattern should be as simple as:
/\d/

Conversely, you can loop over the string an test using ctype_digit().
If no character returns true, then the string has no numerals.
e.g.

function hasDigit($str) {
	$len = strlen($str);
	for ($i = 0; $i < $len; $i++)
		if (ctype_digit($str{$i}))
			return true;
	return false;
}