CODEWITHSUNDEEP
phpregex
Quantum
Quantum

Reputation: 1476

regex - what is the pattern for floating point digit next to unit

basically I want to match a simple thing in a str but only want to return the first part of this match. This is what I want to look in.

Jo 4.5 Oz cold and flu stuff to drink.

and what I want to do is return the 4.5 but only when the match is followed with a variation of the once unit.

Here is my guess

/([0-9]*\.?[0-9])(?:[\s+][o(?<=\.)z(?<=\.)|ounce]?=\s)/i

on matching:

4.5oz
4.5 oz
4.5 o.z.
4.5 oz.
4.5         oz.
4.5ounce
4.5Ounce
4.5 Oz.

but I get when I run it as of yet.

$matches = null;
$returnValue = preg_match('/([0-9]*\.?[0-9])(?:[\s+][o(?<=\.)z(?<=\.)|ounce]?=\s)/i', 'Jo 4.5 Oz cold and flu stuff to drink.', $matches);

Any help would be great. Thank you Cheers -Jeremy

Upvotes: 2

Views: 521

Answers (2)

mason81
mason81

Reputation: 1750

I think it's probably a little more simple than what you're trying there. Give this expression a try:

\s\d+.\d+\s*(oz|ounce|o\.z\.|oz\.)

Or with full php:

$test_string = 'Jo 4.5 Oz cold and flu stuff to drink.';
$returnValue = preg_match('/\s\d+.\d+\s*(oz|ounce|o\.z\.|oz\.)/i', $test_string, $matches);

EDIT

If you want to check if they use a . or a , you could use:

\d+(\.|,)\d+\s*(ounce|o\.?z\.?)

or

 $returnValue = preg_match('/\d+(\.|,)\d+\s*(ounce|o\.?z\.?)/ix', $test_string, $matches);

EDIT 2

If you want named patterns try this:

$returnValue = preg_match('/(?P<amount>\d+(\.|,)\d+)\s*(?P<unit>(ounce|o\.?z\.?))/ix', $test_string, $matches);


print_r($matches);

Output:

Array
(
    [0] => 4.5 Oz
    [amount] => 4.5
    [1] => 4.5
    [2] => .
    [unit] => Oz
    [3] => Oz
    [4] => Oz
)

Upvotes: 1

mario
mario

Reputation: 145482

Then you need a less complex pattern like:

preg_match('/
      (\d+(\.\d+)?)              # float
      \s*                        # optional space
      ( ounce | o\.? z\.? )      # "ounce" or "o.z." or "oz"
   /ix',                         # make it case insensitive
   $string, $matches);

Then either look at result $matches[1] or make the remainder an assertion with by enclosing it in (?=...) or so.

Upvotes: 2

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