PHP preg_split with two delimiters and capture only one

问题

Really poor at regular expressions, sorry in advance!

I've tried my best to work out how to split a string into a array with two delimiters and still capture one and include it in the final array. preg_split seems ideal for this but my regular expression is letting me down.

If for example, I've the string foo = bar AND bar=foo; I want to split the string at either a space, or the = character BUT keep the = so the array would look like:

Array
(
    [0] => foo
    [1] => =
    [2] => bar
    [3] => AND
    [4] => bar
    [5] => =
    [6] => foo
)

Unfortunately, I'm getting this:

Array
(
    [0] => foo
    [1] => 
    [2] => =
    [3] => 
    [4] => bar
    [5] => AND
    [6] => bar
    [7] => =
    [8] => foo
)

I've got here with this code (in PHP):

<!doctype html>
<?php

$string = 'foo = bar AND bar=foo';

$array = preg_split('/ +|(=)/', $string, -1, PREG_SPLIT_DELIM_CAPTURE);

?>
<pre>
<?php

print_r($array);

?>
</pre>

I'd really appreciate any help you guys can give, thanks everyone!

回答1:

Add the PREG_SPLIT_NO_EMPTY flag:

$string = 'foo = bar AND bar=foo';
$array = preg_split('/ +|(=)/', $string, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);

Now, this outputs:

Array
(
    [0] => foo
    [1] => =
    [2] => bar
    [3] => AND
    [4] => bar
    [5] => =
    [6] => foo
)

回答2:

Either use PREG_SPLIT_NO_EMPTY to nuke the "empty" matches:

$array = preg_split('/ +|(=)/', $string, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);

Or, change the regex such that it does not produce empty matches:

$array = preg_split('/ +|(?<!\G)(=)/', $string, -1, PREG_SPLIT_DELIM_CAPTURE);

来源：https://stackoverflow.com/questions/11867342/php-preg-split-with-two-delimiters-and-capture-only-one

标签

php

regex

delimiter

preg-split