php: split string until first occurance of a number

Question

i have string like

cream 100G
sup 5mg Children

i want to split it before the first occurrence of a digit. so the result should be

array(
    array('cream','100G'),
    array('sup','5mg Children')
);

can so one tell me how to create pattern for this ?

i tried

list($before, $after) = array_filter(array_map('trim',
            preg_split('/\b(\d+)\b/', $t->formula)), 'strlen');

but something went wrong.

Is preg_split('/(?=\d)/', $input, 2) what you are looking for? — Jon
– Jon, Commented May 23, 2013 at 9:06

Vijaya Pandey · Accepted Answer · 2013-05-23 09:09:10Z

7

Try this:

<?php 

$first_string = "abc2 2mg";
print_r( preg_split('/(?=\d)/', $first_string, 2));

?>

Will output:

Array ( [0] => abc [1] => 2 2mg )

answered May 23, 2013 at 9:09

Vijaya Pandey

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Jon · Accepted Answer · 2013-05-23 09:09:41Z

4

The regular expression solution would be to call preg_split as

preg_split('/(?=\d)/', $t->formula, 2)

The main point here is that you do not consume the digit used as the split delimiter by using positive lookahead instead of capturing it (so that it remains in $after) and that we ensure the split produces no more than two pieces by using the third argument.

answered May 23, 2013 at 9:09

Jon

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Comments

Ja͢ck · Accepted Answer · 2013-05-23 09:06:52Z

3

You don't need regular expressions for that:

$str = 'cream 100g';

$p = strcspn($str, '0123456789');
$before = substr($str, 0, $p);
$after = substr($str, $p);

echo "before: $before, after: $after";

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