CODEWITHSUNDEEP
php
Tomcomm
Tomcomm

Reputation: 233

Validating String in PHP with pattern match

Hey could someone help me to test if a string matches 3 double digit figures separated by a colon? For Example:

12:13:14

I understand I should be using preg_match but I can't work out how

Preferably the first number should be between 0 and 23 and the second two numbers should be between 0 and 59 like a time but I can always work that out with if statements.

Thanks

Upvotes: 0

Views: 130

Answers (4)

mpratt
mpratt

Reputation: 1608

You could use preg_match with number comparissons on $string = '23:24:25';

preg_match('~^(\d{2}):(\d{2}):(\d{2})$~', $string, $matches);

if (count($matches) != 3 || $matches[1] > 23 || $matches[2] > 59 || $matches[3] > 59 ......)
    die('The digits are not right');

Or you can even ditch the regular expresions and use explode with numeric comparisons.

$numbers = explode(':', $string);

if (count($numbers) != 3 || $numbers[0] > 23 || $numbers[1] > 59 || $numbers[2] > 59 ......)
    die('The digits are not right');

Upvotes: 0

qbert220
qbert220

Reputation: 11556

This answer does correct matching across the entire string (other answers will match the regexp within a longer string), without any extra tests required:

if (preg_match('/^((?:[0-1][0-9])|(?:2[0-3])):([0-5][0-9]):([0-5][0-9])$/', $string, $matches))
{
    print_r($matches);
}
else
{
    echo "Does not match\n";
}

Upvotes: 1

Jeroen
Jeroen

Reputation: 13257

if (preg_match ('/\d\d:\d\d:\d\d/', $input)) {
    // matches
} else {
    // doesnt match
}

\d means any digit, so groups of two of those with : in between.

Upvotes: 0

Pheonix
Pheonix

Reputation: 6052

$regex = "/\d\d\:\d\d\:\d\d/";

$subject = "12:13:14";

preg_match($regex, $subject, $matches);

print_r($matches);

Upvotes: 0

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