SimpleMachines / SMF2.1

							// Reversing a before/after modification becomes a replacement.

							$actual_operation['searches'][$i]['position'] = 'replace';

							if ($search['position'] === 'before')

								$actual_operation['searches'][$i]['search'] .= $search['add'];

							elseif ($search['position'] === 'after')

								$actual_operation['searches'][$i]['search'] = $search['add'] . $search['search'];

						}

						// ...and the search subject is now the replacement.

					}

					// After, after what?

					elseif ($search['position'] === 'after')

					{

						$actual_operation['searches'][$i]['preg_search'] = '(' . $actual_operation['searches'][$i]['preg_search'] . ')';

						$actual_operation['searches'][$i]['preg_replace'] .= '$1';

					}

					// Position the replacement at the end of the file (or just before the closing PHP tags).

					elseif ($search['position'] === 'end')

					}

					// Position the replacement at the end of the file (or just before the closing PHP tags).

					elseif ($search['position'] === 'end')

					{

						if ($undo)

						{

							$actual_operation['searches'][$i]['preg_replace'] = '';

						}

						else

						{

							$actual_operation['searches'][$i]['preg_search'] = '(\\n\\?\\>)?$';

							$actual_operation['searches'][$i]['preg_replace'] .= '$1';

						}

					}

					// Testing 1, 2, 3...

					$failed = preg_match('~' . $actual_operation['searches'][$i]['preg_search'] . '~s', $working_data) === 0;