Prge_replace is not working properly in php

I am trying to replace the below string

`$test_numbers_4 = '\;\3;4;5';


to

3,4,5

3,4,5

Here is my code

$test_numbers_4 = '\;\3;4;5';
printf( "<h4>Task 4:</h4>n" );
$str = preg_replace('/s0,/', '', $test_numbers_4);
$str1 = preg_replace('/\\\|;\\/', ',', $str);
$array = explode(',', $str1);
$res=implode( ',', $array) ;
echo $res;


Output: 3,4,5

3,4,5

Edit:


I have a string like this $string =\,\2,7,-3,5,-2 if string is like this when i run the file i would like to show error message saying that negative numbers -3,-2 not allowed.

$string =\,\2,7,-3,5,-2

negative numbers -3,-2 not allowed.

But it's not giving me the result what I expected

Can anyone help me what is the exact problem?

2 Answers
2

It looks like you're trying to throw away things that are not numbers or ;, in which case you can do that with this code. It uses preg_replace to remove unwanted characters then preg_split to split into an array on ;, with the PREG_SPLIT_NO_EMPTY flag to ensure no empty values in the array.

;

preg_replace

preg_split

;

PREG_SPLIT_NO_EMPTY

$test_numbers_4 = '\;\3;4;5';
$str = preg_replace('/[^d;]/', '', $test_numbers_4);
$array = preg_split('/;/', $str, -1, PREG_SPLIT_NO_EMPTY);
$res=implode(',', $array) ;
echo $res;


Output:

3,4,5


If you specifically want to just remove spaces and double backslashes, then use this preg_replace:

$str = preg_replace('/\\|s+/', '', $test_numbers_4);


You can try this steps to get what you need-

implode it with comma using implode()

DEMO: https://3v4l.org/IKoYt

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