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Oct 6th, 2009

splitting a string with preg_split using multiple delimiters

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Hi,

I'm trying to split a string with multiple delimiters using the PHP preg_split function.

I am trying to separate the numbers from the units in terms like 172px, 100%, 2.5ems etc...

i.e. after I run a preg_split on 172px I want the resulting array to have array[0] = 172 and array[1] = px

Here is the code I've used so far:

PHP Syntax (Toggle Plain Text)
$test = preg_split('(px)(em)(pt)(%))','128px','-1', PREG_SPLIT_DELIM_CAPTURE);
 
echo $test;
$test = preg_split('(px)(em)(pt)(%))','128px','-1', PREG_SPLIT_DELIM_CAPTURE);

echo $test;

However, this echos out the entire thing eg: 128px

If I try something like this,

PHP Syntax (Toggle Plain Text)
$test = preg_split('(px)|(em)|(pt)|(%))','128px','-1', PREG_SPLIT_DELIM_CAPTURE);
 
echo $test;
$test = preg_split('(px)|(em)|(pt)|(%))','128px','-1', PREG_SPLIT_DELIM_CAPTURE);

echo $test;

It works perfectly if I search for 128px. However, it fails for everything else like 128em or 128%.

Any ideas?

Thanks!

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baltazar

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Oct 7th, 2009

Re: splitting a string with preg_split using multiple delimiters

(px|em|pt|%)

pritaeas

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Re: splitting a string with preg_split using multiple delimiters

Click to Expand / Collapse Quote originally posted by pritaeas ...

(px|em|pt|%)

Can you elaborate the syntax a bit more..

network18

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Oct 7th, 2009

Re: splitting a string with preg_split using multiple delimiters

Click to Expand / Collapse Quote originally posted by pritaeas ...

(px|em|pt|%)

He wants to split his string on 'px' or 'em' or 'pt' or '%'
I made it a backreference, but it is probably not necessary.

The code should be:

php Syntax (Toggle Plain Text)
$test = preg_split('/px|em|pt|%/', '128px', -1, PREG_SPLIT_DELIM_CAPTURE);
$test = preg_split('/px|em|pt|%/', '128px', -1, PREG_SPLIT_DELIM_CAPTURE);

Last edited by pritaeas; Oct 7th, 2009 at 6:08 am.

pritaeas

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Re: splitting a string with preg_split using multiple delimiters

PHP Syntax (Toggle Plain Text)
$str = "20px 100% dfsd 10em ";
$test = preg_split('(px|em|pt|%)',$str,-1, PREG_SPLIT_OFFSET_CAPTURE);
//echo '<pre>';
print_r($test);
//echo '</pre>';
$str = "20px 100% dfsd 10em ";
$test = preg_split('(px|em|pt|%)',$str,-1, PREG_SPLIT_OFFSET_CAPTURE);
//echo '<pre>';
print_r($test);
//echo '</pre>';

This isn't working either...what can be the code for it

network18

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Re: splitting a string with preg_split using multiple delimiters

php Syntax (Toggle Plain Text)
$test = preg_split('/px|em|pt|%/',$str,-1, PREG_SPLIT_OFFSET_CAPTURE);
$test = preg_split('/px|em|pt|%/',$str,-1, PREG_SPLIT_OFFSET_CAPTURE);

You should put your regex between slashes. Is this what you want ? Perhaps you want to split also before a number ?

php Syntax (Toggle Plain Text)
$test = preg_split('/(\d+|px|em|pt|%)/',$str,-1, PREG_SPLIT_DELIM_CAPTURE);
$test = preg_split('/(\d+|px|em|pt|%)/',$str,-1, PREG_SPLIT_DELIM_CAPTURE);

I know see that you need to use the parenthesis with the PREG_SPLIT_DELIM_CAPTURE option.

Last edited by pritaeas; Oct 7th, 2009 at 6:29 am.

pritaeas

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Re: splitting a string with preg_split using multiple delimiters

This seperates them all but it isn't the desired yet,
the guy wants it something like

PHP Syntax (Toggle Plain Text)
Array ( [0] => [1] => 20 [2] =>px ) Array([0] => 100 [1] => % )Array([0] => 10 [1] => em )
Array ( [0] => [1] => 20 [2] =>px ) Array([0] => 100 [1] => % )Array([0] => 10 [1] => em )

and we getting Array ( [0] => [1] => 20 [2] => [3] => px [4] => [5] => 100 [6] => [7] => % [8] => dfsd [9] => 10 [10] => [11] => em [12] => )
with

PHP Syntax (Toggle Plain Text)
$test = preg_split('/(\d+|px|em|pt|%)/',$str,-1, PREG_SPLIT_DELIM_CAPTURE);
$test = preg_split('/(\d+|px|em|pt|%)/',$str,-1, PREG_SPLIT_DELIM_CAPTURE);

network18

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Re: splitting a string with preg_split using multiple delimiters

His example only contains '128px', post #4 splits that fine.

Once you introduce other chars into the equasion, I think it's best to remove them first. I'll wait for feedback first from baltazar, and if there is anything else he wants, he should post some more test strings with expected results.

pritaeas

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Re: splitting a string with preg_split using multiple delimiters

Click to Expand / Collapse Quote originally posted by pritaeas ...

php Syntax (Toggle Plain Text)
$test = preg_split('/px|em|pt|%/',$str,-1, PREG_SPLIT_OFFSET_CAPTURE);
$test = preg_split('/px|em|pt|%/',$str,-1, PREG_SPLIT_OFFSET_CAPTURE);
You should put your regex between slashes. Is this what you want ? Perhaps you want to split also before a number ?
php Syntax (Toggle Plain Text)
$test = preg_split('/(\d+|px|em|pt|%)/',$str,-1, PREG_SPLIT_DELIM_CAPTURE);
$test = preg_split('/(\d+|px|em|pt|%)/',$str,-1, PREG_SPLIT_DELIM_CAPTURE);
I know see that you need to use the parenthesis with the PREG_SPLIT_DELIM_CAPTURE option.

Hi guys... thank you so much for giving your time to my problem.

Pritaeas, your solution worked.

For the record, I have a single variable that contains the width of a div. for example: 128px or 100% or 50em. There will be only one of the above, not all of them. I want to split the number from the unit.

So using:

php Syntax (Toggle Plain Text)
$test = preg_split('/(|px|em|pt|%)/',$str,-1, PREG_SPLIT_DELIM_CAPTURE);
$test = preg_split('/(|px|em|pt|%)/',$str,-1, PREG_SPLIT_DELIM_CAPTURE);

works perfectly.

Thank you all once again and hopefully I shall be able to return the favour someday. Cheers!

baltazar

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