PHP preg_split with two delimiters and capture onl

2019-08-27 10:50发布

站内问答 / PHP
1845 2 4

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!

2条回答
乱世女痞
2楼-- · 2019-08-27 11:42

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
)
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不美不萌又怎样
3楼-- · 2019-08-27 11:43

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);
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