Question

I need to replace link index.php?a=2 ,but if it’s have & after a=2 then don’t replace it.

index.php?a=2 <- replace
index.php?a=2&b=3 <- don't replace


Using PHP, preg_replace()

I have tried using this:

preg_replace('^index\.php\?a=([0-9]+)(?!amp;)^', 'home', 'index.php?a=2');
preg_replace('^index\.php\?a=([0-9]+)(?!amp;)^', 'home', 'index.php?a=2&b=3');
preg_replace('^index\.php\?a=([0-9]+)(?!&)^', 'home', 'index.php?a=2');
preg_replace('^index\.php\?a=([0-9]+)(?!&)^', 'home', 'index.php?a=2&b=3');

That I’m using:

preg_replace('^(\/*)index\.php\?a=([0-9]+)(?!&)^e', "a($2)", 'index.php?a=2');

function a($id) {
  // Getting name from mysql...
  return '/a$id_$name';
}

It’s working with this: index.php?a=2&b0, but with index.php?a=10&b=0 not.

Answer 1

PHP Script:

<?php
print preg_replace('/index\.php\?a=[0-9]+(?!&)/', 'home', 'index.php?a=2');
print "\n";
print preg_replace('/index\.php\?a=[0-9]+(?!&)/', 'home', 'index.php?a=2&b=3'); 
?>

Output:

home
index.php?a=2&b=3

Test the code here.