正则表达式查找和替换印度字符

Question

I have a text file as follows

{{https://www.test.com/events/test-event-२०१८/२०१८-.१-entry-list|caption=test event of २०१८}}{{https://www.test.com/events/test-event-३१/३१-.१-entry-list|caption=test event of ३१}}{{https://www.test.com/events/test-event-१८/१८-.१-entry-list|caption=test event of १८}}

I want to change all the instances of indic characters to their english equivalent only in the URL(s) and not the captions.

For Ex: २ becomes 2 and so on. I am trying to write an RegEx which will replaces all the instances between "/" of the URLs. Having no luck so far!.

My code is as follows

<?php
$pattern = "/\/([२]+)\//u";
$text=file_get_contents("Test.txt");
$text = preg_replace($pattern,'2',$text);
file_put_contents("MR-Test.txt",$text);
?>

Nothing seems to work so far!

Edit: The url(s) i am using are in a text file and i have to replace only the indic text in URL and no where else..

Answer 1

Our desired २ comes first, which we collect, then we collect the undesired २ s using alternation:

(२)|(caption=(.+?)}})

finally, we would be replacing that with 2 and $2 .

Demo

Test

$re = '/(२)|(caption=(.+?)}})/m';
$str = '{{https://www.test.com/events/test-event-२०१८/२०१८-.१-entry-list|caption=test event of २०१८}}{{https://www.test.com/events/test-event-३१/३१-.१-entry-list|caption=test event of ३१}}{{https://www.test.com/events/test-event-१८/१८-.१-entry-list|caption=test event of १८}}';
$subst = '2$2';

$result = preg_replace($re, $subst, $str);

echo $result;

Output

{{https://www.test.com/events/test-event-2०१८/2०१८-.१-entry-list|2caption=test event of २०१८}}{{https://www.test.com/events/test-event-३१/३१-.१-entry-list|2caption=test event of ३१}}{{https://www.test.com/events/test-event-१८/१८-.१-entry-list|2caption=test event of १८}}

Answer 2

Here is a way to do the job with preg_replace_callback, first find the right digits to replace then replace them in the callback:

$text = '{{https://www.test.com/events/test-event-२०१८/२०१८-.१-entry-list|caption=test event of २०१८}}{{https://www.test.com/events/test-event-३१/३१-.१-entry-list|caption=test event of ३१}}{{https://www.test.com/events/test-event-१८/१८-.१-entry-list|caption=test event of १८}}';

$res = preg_replace_callback('/caption=.+?}}(*SKIP)(*F)|[०१२३४५६७८९]/u', 
                    function($m) {
                        return preg_replace(
                            array('/०/','/१/','/२/','/३/','/४/','/५/','/६/','/७/','/८/','/९/'), 
                            array('0','1','2','3','4','5','6','7','8','9'), 
                            $m[0]);
                    }
                    , $text);
echo $res,"\n";

Output:

{{https://www.test.com/events/test-event-2018/2018-.1-entry-list|caption=test event of २०१८}}{{https://www.test.com/events/test-event-31/31-.1-entry-list|caption=test event of ३१}}{{https://www.test.com/events/test-event-18/18-.1-entry-list|caption=test event of १८}}

Explanation:

caption=.+?}}       # matches caption until }}
(*SKIP)(*F)         # and skip that match
|                   # OR
[०१२३४५६७८९]          # 1 digit