How to separate letters and digits from a string i

问题:

I have a string which is combination of letters and digits. For my application i have to separate a string with letters and digits: ex:If my string is "12jan" i hav to get "12" "jan" separately..

回答1:

You can make use of preg_split to split your string at the point which is preceded by digit and is followed by letters as:

$arr = preg_split('/(?<=[0-9])(?=[a-z]+)/i',$str);

Code in Action

<?php
$str = '12jan';
$arr = preg_split('/(?<=[0-9])(?=[a-z]+)/i',$str);                                                               
print_r($arr);

Result:

Array
(
    [0] => 12
    [1] => jan
)

回答2:

$numbers = preg_replace('/[^0-9]/', '', $str);
$letters = preg_replace('/[^a-zA-Z]/', '', $str);

回答3:

$string = "12312313sdfsdf24234";
preg_match_all('/([0-9]+|[a-zA-Z]+)/',$string,$matches);
print_r($matches);

this might work alot better

回答4:

preg_match_all('/^(\d+)(\w+)$/', $str, $matches);

var_dump($matches);

$day = $matches[1][0];
$month = $matches[2][0];

Of course, this only works when your strings are exactly as described "abc123" (with no whitespace appended or prepended).

If you want to get all numbers and characters, you can do it with one regex.

preg_match_all('/(\d)|(\w)/', $str, $matches);

$numbers = implode($matches[1]);
$letters = implode($matches[2]);

var_dump($numbers, $letters);

See it!

回答5:

This works for me as per my requirement, you can edit as per yours

function stringSeperator($string,$type_return){

    $numbers =array();
    $alpha = array();
    $array = str_split($string);
    for($x = 0; $x< count($array); $x++){
        if(is_numeric($array[$x]))
            array_push($numbers,$array[$x]);
        else
            array_push($alpha,$array[$x]);
    }// end for         

    $alpha = implode($alpha);
    $numbers = implode($numbers);

    if($type_return == 'number')    
    return $numbers;
    elseif($type_return == 'alpha')
    return $alpha;

}// end function

回答6:

Try This :

$string="12jan";
$chars = '';
$nums = '';
for ($index=0;$index<strlen($string);$index++) {
    if(isNumber($string[$index]))
        $nums .= $string[$index];
    else    
        $chars .= $string[$index];
}
echo "Chars: -$chars-<br>Nums: -$nums-";


function isNumber($c) {
    return preg_match('/[0-9]/', $c);
} 

回答7:

Having worked more with PHPExcel, such operations are common. #Tapase,. Here is a preg_split that gets you want you want with space within the string.

<?php
$str = "12 January";
$tempContents = preg_split("/[\s]+/", $str);
foreach($tempContents as $temp){
echo '<br/>'.$temp;
}
?>

You can add a comma next to the s for comma seperated. Hope it helps someone. Anton K.

回答8:

<?php
$data = "#c1";
$fin =  ltrim($data,'#c');
echo $fin;
?>