<?php
  $wanttodecode = 'one%20%26%20two';
  $textdecode   = urldecode($wanttodecode); // one%20%26%20two -> one & two

https://developers.facebook.com/tools/debug/

var regex = /https?:\/\/line\.me\/ti\/p\/~(\d+)/g;
var str = `http://line.me/ti/p/~123456`;
var m;

while ((m = regex.exec(str)) !== null) {
    // This is necessary to avoid infinite loops with zero-width matches
    if (m.index === regex.lastIndex) {
        regex.lastIndex++;
    }
    
    // The result can be accessed through the `m`-variable.
    m.forEach((match, groupIndex) => {
        console.log(`Found match, group ${groupIndex}: ${match}`);
    });
}