stdout

Some text N_abc_New_New_New_N! other text N_ghi_jkl_N and other text:;.#{}()[]N_abc_New_N.!@
Немного текста abc_New_New_New ! другой текст ghi_jkl и другой текст:;. # {} () [] abc_New ! @
Some text N_abc_New_New_New_N! other text N_ghi_jkl_N and other text:;.#{}()[]N_abc_New_N.!@
Lego_New New_Friends_New Lego_New

---------
Some text N_abc_New_New_New_N! other text N_ghi_jkl_N and other text:;.#{}()[]N_abc_New_N.!@
Du texte abc_New_New_New ! autre texte ghi_jkl et autre texte:;. # {} () [] abc_New ! @

---------
Some text N_abc_New_New_New_N! other text N_ghi_jkl_N and other text:;.#{}()[]N_abc_New_N.!@
Qualche testo abc_New_New_New ! altro testo ghi_jkl e altro testo:;. # {} () [] abc_New ! @

---------
N_Lego_New_N N_New_Friends_New_N  N_Lego_New_N 
Lego_New New_Friends_New Lego_New

---------
Some N_Mercedes-Benz_N, N_Chick-fil-A_N text N_abc_New_New_New_N other text N_ghi_jkl_N and other text:;.#{}()[]N_McDonald's*!&HP_"hey"_"A"_N.!@ N_"Actions Speak Louder Than Words"_N
بعض Mercedes-Benz و Chick-fil-A نص abc_New_New_New نص آخر ghi_jkl ونص آخر: ؛. # {} () [] McDonald's*!&HP_"hey"_"A" ! @ "Actions Speak Louder Than Words"

---------
Some N_ free escaped text "string" which has @ny S!mB0l _N
بعض  free escaped text "string" which has @ny S!mB0l 

---------
this is not working and like I'm like, you know, three years later, and I'm like sort of a king in this, in this world that I exist in. N_Ξ_N N_Я_N N_$_N I N_❤_N NY
これは働いておらず、私はあなたが3年後に、知っている、と私は私が存在すЯ $ I ❤ NY

---------
some text N_Ξ_N N_Я_N N_₱_N N_$_N N_£_N N_₩_N I N_❤_N NY N_/_N N_\_N N_$_N
一部のテキストΞ Я ₱ $ £ ₩ I ❤ NY / \ $

---------

translation-example.php

<?php
require_once('vendor/autoload.php');

use Google\Cloud\Translate\V2\TranslateClient;

class WrapperMatcher {

    private $startPattern = 'N_';
    private $endPattern = '_N';

    /**
     * WrapperMatcher constructor.
     *
     * @param string $startPattern Left pattern (opening wrapper). Example: "N_ some string _N"  $startPattern = 'N_'
     * @param string $endPattern Right pattern (closing wrapper). Example: "N_ some string _N"  $startPattern = '_N'
     */
    public function __construct($startPattern, $endPattern) {
        $startPattern = trim($startPattern);
        if (!$startPattern) throw new Error('Invalid wrapper start pattern');

        $endPattern = trim($endPattern);
        if (!$endPattern) throw new Error('Invalid wrapper start pattern');

        $this->startPattern = $startPattern;
        $this->endPattern = $endPattern;
    }

    private function lookupPositions($searchString) {
        $chunkSize =
            strlen($this->startPattern) > strlen($this->endPattern)
                ? strlen($this->startPattern)
                : strlen($this->endPattern);
        $minChunkSize =
            strlen($this->startPattern) > strlen($this->endPattern)
                ? strlen($this->endPattern)
                : strlen($this->startPattern);

        $foundPositions = [];
        $cursor = 0;
        do {
            $chunk = substr($searchString, $cursor, $chunkSize);

            if (mb_strpos($chunk, $this->startPattern) === 0) {
                $foundPositions[] = ['type' => 'start', 'pos' => $cursor];
                $cursor += $chunkSize - $minChunkSize;
            }

            if (mb_strpos($chunk, $this->endPattern) === 0) {
                $foundPositions[] = ['type' => 'end', 'pos' => $cursor];
                $cursor += $chunkSize - $minChunkSize;
            }

            $cursor++;
        }
        while($cursor < strlen($searchString));

        $previousPosition = null;
        $nextPosition = null;
        $positions = [];
        foreach($foundPositions AS $i => $foundPosition) {
            if ($foundPosition['type'] === 'start') {
                $previousPosition = $foundPosition;
                $nextPosition = null;

                $c = $i + 1;
                while ($nextPosition['type'] === 'end' || $c < sizeof($foundPositions)) {
                    if ($nextPosition) {
                        $previousPosition = $nextPosition;
                    }

                    $nextPosition = $foundPositions[$c];
                    if ($nextPosition['type'] === 'start' || $c === sizeof($foundPositions) - 1) {
                        $positions[] = [
                            $foundPosition['pos'],
                            $previousPosition['pos']
                        ];
                        break;
                    }

                    $c++;
                }
            }
        }

        if ($nextPosition) {
            $positions[sizeof($positions) - 1][1] = $nextPosition['pos'];
        }

        $positions = array_filter($positions, function($position) {
            return $position[0] !== $position[1];
        });

        return $positions;
    }

    private function getMatches($searchString, $positions) {
        $matches = [[], []];
        foreach ($positions AS $position) {
            $matches[0][] = substr($searchString, $position[0], $position[1] - $position[0] + strlen($this->endPattern));
            $matches[1][] = substr($searchString, $position[0] + strlen($this->startPattern), $position[1] - $position[0] - strlen($this->startPattern));
        }
        return $matches;
    }

    public function matchForString($searchString) {
        if ($this->startPattern === $this->endPattern) {
            $pattern = preg_quote($this->startPattern);
            $regexp = '/'.$pattern.'(.*?)'.$pattern.'/u';
            preg_match_all($regexp, $searchString, $matches);
            array_walk($matches[0], function(&$item) {
                $item = trim($item);
            });
            return $matches;
        }

        $positions = $this->lookupPositions($searchString);
        return $this->getMatches($searchString, $positions);
    }
}

class WrappedTranslator {
    private $startPattern;
    private $endPattern;

    public function __construct($startPattern, $endPattern) {
        $this->startPattern = $startPattern;
        $this->endPattern = $endPattern;
    }


    private function replaceFirst($search, $replace, $subject) {
        $pos = strpos($subject, $search);
        if ($pos !== false) {
            $before = substr($subject, 0, $pos);
            $after = substr($subject, $pos + strlen($search));
            $subject = $before.$replace.$after;
        }
        return $subject;
    }

    private $placeholderLeftWrapper = '<span translate="no">';
    private $placeholderRightWrapper = '</span>';
    private $whitespaceLeft = '';
    private $whitespaceRight = '';

    private function preserveWrappedPhrases($text,  &$matches) {
        $matches[2] = [];
        $placeholdingElement = 0;
        foreach ($matches[0] AS $i => $wrapped) {
            $placeholdingElement++;
            $placeholder = $this->placeholderLeftWrapper . $placeholdingElement . $this->placeholderRightWrapper;
            $matches[2][$i] = $placeholdingElement;
            $text = $this->replaceFirst($wrapped, $placeholder, $text);
        }
        return $text;
    }

    private function putWrappedPhrasesBack($text, &$matches) {
        foreach ($matches[2] AS $i => $placeholdingElement) {
            $placeholder = $this->placeholderLeftWrapper . $this->whitespaceLeft . $placeholdingElement . $this->whitespaceRight . $this->placeholderRightWrapper;
            $phrase = $matches[1][$i];
            $text = $this->replaceFirst($placeholder, $phrase, $text);
        }
        return $text;
    }

    public function translate($originalTexts, $targetLanguage) {
        $preservedTexts = [];
        $allMatches = [];
        foreach ($originalTexts AS $t => $originalText) {
            $matches = $this->matchWrappedPhares($originalText);
            $preservedTexts[] = $this->preserveWrappedPhrases($originalText, $matches);
            $allMatches[$t] = [[], [], []];
            foreach ($matches[0] AS $i => $match) {
                $allMatches[$t][0][] = $matches[0][$i];
                $allMatches[$t][1][] = $matches[1][$i];
                $allMatches[$t][2][] = $matches[2][$i];
            }
        }

        $translatedTexts = $this->googleTranslateIt($preservedTexts, $targetLanguage);

        $result = [];
        foreach ($translatedTexts AS $t => $translatedText) {
            $result[$t] = $this->putWrappedPhrasesBack($translatedText, $allMatches[$t]);
        }
        return $result;
    }

    private function matchWrappedPhares($text) {
        return (new WrapperMatcher($this->startPattern, $this->endPattern))->matchForString($text);
    }

    private function googleTranslateIt($texts, $target) {
        // ToDo: REPLACE THIS WITH YOUR OWN TRANSLATE METHOD THAT RETURNS TRANSLATED STRING
        $translate = new TranslateClient([
            'key' => 'AIzaSyCqy1m_REtoq5aZb30gKpHnRPTvhmM3_-M'
        ]);
        $result = $translate->translateBatch($texts, ['target' => $target, 'format' => 'html']);
        return array_map(function($result) {return $result['text'];}, $result);
    }
}



$originalText1 = 'Some text N_abc_New_New_New_N! other text N_ghi_jkl_N and other text:;.#{}()[]N_abc_New_N.!@';
$originalText2 = "N_Lego_New_N N_New_Friends_New_N  N_Lego_New_N ";

$translatedTexts = (new WrappedTranslator('N_', '_N'))->translate([$originalText1, $originalText2], 'ru');
echo $originalText1."\n";
echo $translatedTexts[0]."\n";
echo $originalText1."\n";
echo $translatedTexts[1]."\n";
echo "\n---------\n";

$originalText = 'Some text N_abc_New_New_New_N! other text N_ghi_jkl_N and other text:;.#{}()[]N_abc_New_N.!@';
$translatedText = (new WrappedTranslator('N_', '_N'))->translate([$originalText], 'fr');
echo $originalText."\n";
echo $translatedText[0]."\n";
echo "\n---------\n";

$originalText = 'Some text N_abc_New_New_New_N! other text N_ghi_jkl_N and other text:;.#{}()[]N_abc_New_N.!@';
$translatedText = (new WrappedTranslator('N_', '_N'))->translate([$originalText], 'it');
echo $originalText."\n";
echo $translatedText[0]."\n";
echo "\n---------\n";

$originalText = "N_Lego_New_N N_New_Friends_New_N  N_Lego_New_N ";
$translatedText = (new WrappedTranslator('N_', '_N'))->translate([$originalText], 'ar');
echo $originalText."\n";
echo $translatedText[0]."\n";
echo "\n---------\n";

$originalText = 'Some N_Mercedes-Benz_N, N_Chick-fil-A_N text N_abc_New_New_New_N other text N_ghi_jkl_N and other text:;.#{}()[]N_McDonald\'s*!&HP_"hey"_&quot;A&quot;_N.!@ N_"Actions Speak Louder Than Words"_N';
$translatedText = (new WrappedTranslator('N_', '_N'))->translate([$originalText], 'ar');
echo $originalText."\n";
echo $translatedText[0]."\n";
echo "\n---------\n";

$originalText = 'Some N_ free escaped text "string" which has @ny S!mB0l _N';
$translatedText = (new WrappedTranslator('N_', '_N'))->translate([$originalText], 'ar');
echo $originalText."\n";
echo $translatedText[0]."\n";
echo "\n---------\n";

$originalText = 'this is not working and like I\'m like, you know, three years later, and I\'m like sort of a king in this, in this world that I exist in. N_Ξ_N N_Я_N N_$_N I N_❤_N NY';
$translatedText = (new WrappedTranslator('N_', '_N'))->translate([$originalText], 'ja');
echo $originalText."\n";
echo $translatedText[0]."\n";
echo "\n---------\n";

$originalText = 'some text N_Ξ_N N_Я_N N_₱_N N_$_N N_£_N N_₩_N I N_❤_N NY N_/_N N_\_N N_$_N';
$translatedText = (new WrappedTranslator('N_', '_N'))->translate([$originalText], 'ja');
echo $originalText."\n";
echo $translatedText[0]."\n";
echo "\n---------\n";