Having an issue with the preg_split function in PHP.
My regular expression is:
#^(-?[0-9]+)(([+x])(-?[0-9]+))*$#
I am trying to transform this input:
-5+69x45
into an array like this:
{
[0] = -5
[1] = +
[2] = 69
[3] = x
[4] = 45
}
The regular expression works with preg_match, but not with preg_split. It returns an empty array without flags:
{
[0] = -5
[1] = x
[2] = 45
}
Using the flag PREG_SPLIT_DELIM_CAPTURE, I still encounter the same issue. Where could my error be?
It seems there may have been a misunderstanding regarding the usage of preg_split.
Essentially, the pattern you specify is utilized to divide the string, resulting in the parts of the string that match your pattern not being included in the final array.
By implementing the PREG_SPLIT_DELIM_CAPTURE flag, the content within the capturing groups gets appended to the resultant array (preg_spit documentation).
#^(-?[0-9]+)(([+x])(-?[0-9]+))*$#
^^^^^^^^^^^^^^^^^^
However, since there is a quantifier around the last two groups, only the final match is stored in $2 and $3. Consequently, the initial match "69+" is overwritten, resulting in:
$1 = -5
$2 = x
$3 = 45
Here is a code snippet for parsing a mathematical expression:
$str = '-5+69x45';
$arr = preg_split('#([+x]|-?\d+)#', $str, 0, PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY );
print_r($arr);
OUTPUT:
Array
(
[0] => -5
[1] => +
[2] => 69
[3] => x
[4] => 45
)
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