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Further on from my previous question about preg_split which was answers super fast, thanks to nick; I would really like to extend the scenario to no split the string when a delimiter is within quotes. For example:
If I have the string foo = bar AND bar=foo OR foobar="foo bar", I'd wish to split the sting on every space or = character but include the = character in the returned array (which works great currently), but I don't want to split the string either of the delimiters are within quotes.
I've got this so far:
<!doctype html>
<?php
$string = 'foo = bar AND bar=foo';
$array = preg_split('/ +|(=)/', $string, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
?>
<pre>
<?php
print_r($array);
?>
</pre>
Which gets me:
Array
(
[0] => foo
[1] => =
[2] => bar
[3] => AND
[4] => bar
[5] => =
[6] => foo
)
But if I changed the string to:
$string = 'foo = bar AND bar=foo OR foobar = "foo bar"';
I'd really like the array to be:
Array
(
[0] => foo
[1] => =
[2] => bar
[3] => AND
[4] => bar
[5] => =
[6] => foo
[6] => OR
[6] => foobar
[6] => =
[6] => "foo bar"
)
Notice the "foo bar" wasn't split on the space because it's in quotes?
Really not sure how to do this within the RegEx or if there is even a better way but all your help would be very much appreciated!
Thank you all in advance!
621
Try
$array = preg_split('/(?: +|(=))(?=(?:[^"]*"[^"]*")*[^"]*$)/', $string, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
The
(?=(?:[^"]*"[^"]*")*[^"]*$)
part is a lookahead assertion making sure that there is an even number of quote characters ahead in the string, therefore it will fail if the current position is between quotes:
(?= # Assert that the following can be matched:
(?: # A group containing...
[^"]*" # any number of non-quote characters followed by one quote
[^"]*" # the same (to ensure an even number of quotes)
)* # ...repeated zero or more times,
[^"]* # followed by any number of non-quotes
$ # until the end of the string
)
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