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phpstringreplacepreg-replace

Remove a part of a string, but only when it is at the end of the string

I need to remove a substring of a string, but only when it is at the END of the string.

for example, removing 'string' at the end of the following strings :

"this is a test string" ->  "this is a test "
"this string is a test string" - > "this string is a test "
"this string is a test" -> "this string is a test"

Any idea's ? Probably some kind of preg_replace, but how??

Solution

  • You'll note the use of the $ character, which denotes the end of a string:

    $new_str = preg_replace('/string$/', '', $str);

    If the string is a user supplied variable, it is a good idea to run it through preg_quote first:

    $remove = $_GET['remove']; // or whatever the case may be
$new_str = preg_replace('/'. preg_quote($remove, '/') . '$/', '', $str);