Resolve #3492819 "Use multibyte uppercase lowercase functions"

src/Plugin/token_modifier/Lowercase.php

@@ -19,7 +19,7 @@ class Lowercase extends TokenModifierPluginBase {
    * {@inheritdoc}
    */
   public function transform(string $text, array $data = [], array $options = []) {
-    return strtolower($this->token->replace($text, $data, $options));
+    return mb_strtolower($this->token->replace($text, $data, $options));
   }
 
 }

src/Plugin/token_modifier/TitleCase.php

@@ -19,7 +19,14 @@ class TitleCase extends TokenModifierPluginBase {
    * {@inheritdoc}
    */
   public function transform(string $text, array $data = [], array $options = []) {
-    return ucwords($this->token->replace($text, $data, $options));
+    return $this->mb_ucwords($this->token->replace($text, $data, $options));
+  }
+
+  protected function mb_ucwords(string $text): array|string|null {
+    $regex = '/(?<![\x{0027}\x{002E}\x{003A}\x{005E}\x{0060}\x{00A8}\x{00AD}\x{00AF}\x{00B4}\x{00B7}\x{00B8}\x{02B0}-\x{02C1}\x{02C2}-\x{02C5}\x{02C6}-\x{02D1}\x{02D2}-\x{02DF}\x{02E0}-\x{02E4}\x{02E5}-\x{02EB}\x{02EC}\x{02ED}\x{02EE}\x{02EF}-\x{02FF}\x{0300}-\x{036F}\x{0374}\x{0375}\x{037A}\x{0384}-\x{0385}\x{0387}\x{0483}-\x{0487}\x{0488}-\x{0489}\x{0559}\x{0591}-\x{05BD}\x{05BF}\x{05C1}-\x{05C2}\x{05C4}-\x{05C5}\x{05C7}\x{05F4}\x{0600}-\x{0605}\x{0610}-\x{061A}\x{061C}\x{0640}\x{064B}-\x{065F}\x{0670}\x{06D6}-\x{06DC}\x{06DD}\x{06DF}-\x{06E4}\x{06E5}-\x{06E6}\x{06E7}-\x{06E8}\x{06EA}-\x{06ED}\x{070F}\x{0711}\x{0730}-\x{074A}\x{07A6}-\x{07B0}\x{07EB}-\x{07F3}\x{07F4}-\x{07F5}\x{07FA}\x{07FD}\x{0816}-\x{0819}\x{081A}\x{081B}-\x{0823}\x{0824}\x{0825}-\x{0827}\x{0828}\x{0829}-\x{082D}\x{0859}-\x{085B}\x{08D3}-\x{08E1}\x{08E2}\x{08E3}-\x{0902}\x{093A}\x{093C}\x{0941}-\x{0948}\x{094D}\x{0951}-\x{0957}\x{0962}-\x{0963}\x{0971}\x{0981}\x{09BC}\x{09C1}-\x{09C4}\x{09CD}\x{09E2}-\x{09E3}\x{09FE}\x{0A01}-\x{0A02}\x{0A3C}\x{0A41}-\x{0A42}\x{0A47}-\x{0A48}\x{0A4B}-\x{0A4D}\x{0A51}\x{0A70}-\x{0A71}\x{0A75}\x{0A81}-\x{0A82}\x{0ABC}\x{0AC1}-\x{0AC5}\x{0AC7}-\x{0AC8}\x{0ACD}\x{0AE2}-\x{0AE3}\x{0AFA}-\x{0AFF}\x{0B01}\x{0B3C}\x{0B3F}\x{0B41}-\x{0B44}\x{0B4D}\x{0B56}\x{0B62}-\x{0B63}\x{0B82}\x{0BC0}\x{0BCD}\x{0C00}\x{0C04}\x{0C3E}-\x{0C40}\x{0C46}-\x{0C48}\x{0C4A}-\x{0C4D}\x{0C55}-\x{0C56}\x{0C62}-\x{0C63}\x{0C81}\x{0CBC}\x{0CBF}\x{0CC6}\x{0CCC}-\x{0CCD}\x{0CE2}-\x{0CE3}\x{0D00}-\x{0D01}\x{0D3B}-\x{0D3C}\x{0D41}-\x{0D44}\x{0D4D}\x{0D62}-\x{0D63}\x{0DCA}\x{0DD2}-\x{0DD4}\x{0DD6}\x{0E31}\x{0E34}-\x{0E3A}\x{0E46}\x{0E47}-\x{0E4E}\x{0EB1}\x{0EB4}-\x{0EB9}\x{0EBB}-\x{0EBC}\x{0EC6}\x{0EC8}-\x{0ECD}\x{0F18}-\x{0F19}\x{0F35}\x{0F37}\x{0F39}\x{0F71}-\x{0F7E}\x{0F80}-\x{0F84}\x{0F86}-\x{0F87}\x{0F8D}-\x{0F97}\x{0F99}-\x{0FBC}\x{0FC6}\x{102D}-\x{1030}\x{1032}-\x{1037}\x{1039}-\x{103A}\x{103D}-\x{103E}\x{1058}-\x{1059}\x{105E}-\x{1060}\x{1071}-\x{1074}\x{1082}\x{1085}-\x{1086}\x{108D}\x{109D}\x{10FC}\x{135D}-\x{135F}\x{1712}-\x{1714}\x{1732}-\x{1734}\x{1752}-\x{1753}\x{1772}-\x{1773}\x{17B4}-\x{17B5}\x{17B7}-\x{17BD}\x{17C6}\x{17C9}-\x{17D3}\x{17D7}\x{17DD}\x{180B}-\x{180D}\x{180E}\x{1843}\x{1885}-\x{1886}\x{18A9}\x{1920}-\x{1922}\x{1927}-\x{1928}\x{1932}\x{1939}-\x{193B}\x{1A17}-\x{1A18}\x{1A1B}\x{1A56}\x{1A58}-\x{1A5E}\x{1A60}\x{1A62}\x{1A65}-\x{1A6C}\x{1A73}-\x{1A7C}\x{1A7F}\x{1AA7}\x{1AB0}-\x{1ABD}\x{1ABE}\x{1B00}-\x{1B03}\x{1B34}\x{1B36}-\x{1B3A}\x{1B3C}\x{1B42}\x{1B6B}-\x{1B73}\x{1B80}-\x{1B81}\x{1BA2}-\x{1BA5}\x{1BA8}-\x{1BA9}\x{1BAB}-\x{1BAD}\x{1BE6}\x{1BE8}-\x{1BE9}\x{1BED}\x{1BEF}-\x{1BF1}\x{1C2C}-\x{1C33}\x{1C36}-\x{1C37}\x{1C78}-\x{1C7D}\x{1CD0}-\x{1CD2}\x{1CD4}-\x{1CE0}\x{1CE2}-\x{1CE8}\x{1CED}\x{1CF4}\x{1CF8}-\x{1CF9}\x{1D2C}-\x{1D6A}\x{1D78}\x{1D9B}-\x{1DBF}\x{1DC0}-\x{1DF9}\x{1DFB}-\x{1DFF}\x{1FBD}\x{1FBF}-\x{1FC1}\x{1FCD}-\x{1FCF}\x{1FDD}-\x{1FDF}\x{1FED}-\x{1FEF}\x{1FFD}-\x{1FFE}\x{200B}-\x{200F}\x{2018}\x{2019}\x{2024}\x{2027}\x{202A}-\x{202E}\x{2060}-\x{2064}\x{2066}-\x{206F}\x{2071}\x{207F}\x{2090}-\x{209C}\x{20D0}-\x{20DC}\x{20DD}-\x{20E0}\x{20E1}\x{20E2}-\x{20E4}\x{20E5}-\x{20F0}\x{2C7C}-\x{2C7D}\x{2CEF}-\x{2CF1}\x{2D6F}\x{2D7F}\x{2DE0}-\x{2DFF}\x{2E2F}\x{3005}\x{302A}-\x{302D}\x{3031}-\x{3035}\x{303B}\x{3099}-\x{309A}\x{309B}-\x{309C}\x{309D}-\x{309E}\x{30FC}-\x{30FE}\x{A015}\x{A4F8}-\x{A4FD}\x{A60C}\x{A66F}\x{A670}-\x{A672}\x{A674}-\x{A67D}\x{A67F}\x{A69C}-\x{A69D}\x{A69E}-\x{A69F}\x{A6F0}-\x{A6F1}\x{A700}-\x{A716}\x{A717}-\x{A71F}\x{A720}-\x{A721}\x{A770}\x{A788}\x{A789}-\x{A78A}\x{A7F8}-\x{A7F9}\x{A802}\x{A806}\x{A80B}\x{A825}-\x{A826}\x{A8C4}-\x{A8C5}\x{A8E0}-\x{A8F1}\x{A8FF}\x{A926}-\x{A92D}\x{A947}-\x{A951}\x{A980}-\x{A982}\x{A9B3}\x{A9B6}-\x{A9B9}\x{A9BC}\x{A9CF}\x{A9E5}\x{A9E6}\x{AA29}-\x{AA2E}\x{AA31}-\x{AA32}\x{AA35}-\x{AA36}\x{AA43}\x{AA4C}\x{AA70}\x{AA7C}\x{AAB0}\x{AAB2}-\x{AAB4}\x{AAB7}-\x{AAB8}\x{AABE}-\x{AABF}\x{AAC1}\x{AADD}\x{AAEC}-\x{AAED}\x{AAF3}-\x{AAF4}\x{AAF6}\x{AB5B}\x{AB5C}-\x{AB5F}\x{ABE5}\x{ABE8}\x{ABED}\x{FB1E}\x{FBB2}-\x{FBC1}\x{FE00}-\x{FE0F}\x{FE13}\x{FE20}-\x{FE2F}\x{FE52}\x{FE55}\x{FEFF}\x{FF07}\x{FF0E}\x{FF1A}\x{FF3E}\x{FF40}\x{FF70}\x{FF9E}-\x{FF9F}\x{FFE3}\x{FFF9}-\x{FFFB}\x{101FD}\x{102E0}\x{10376}-\x{1037A}\x{10A01}-\x{10A03}\x{10A05}-\x{10A06}\x{10A0C}-\x{10A0F}\x{10A38}-\x{10A3A}\x{10A3F}\x{10AE5}-\x{10AE6}\x{10D24}-\x{10D27}\x{10F46}-\x{10F50}\x{11001}\x{11038}-\x{11046}\x{1107F}-\x{11081}\x{110B3}-\x{110B6}\x{110B9}-\x{110BA}\x{110BD}\x{110CD}\x{11100}-\x{11102}\x{11127}-\x{1112B}\x{1112D}-\x{11134}\x{11173}\x{11180}-\x{11181}\x{111B6}-\x{111BE}\x{111C9}-\x{111CC}\x{1122F}-\x{11231}\x{11234}\x{11236}-\x{11237}\x{1123E}\x{112DF}\x{112E3}-\x{112EA}\x{11300}-\x{11301}\x{1133B}-\x{1133C}\x{11340}\x{11366}-\x{1136C}\x{11370}-\x{11374}\x{11438}-\x{1143F}\x{11442}-\x{11444}\x{11446}\x{1145E}\x{114B3}-\x{114B8}\x{114BA}\x{114BF}-\x{114C0}\x{114C2}-\x{114C3}\x{115B2}-\x{115B5}\x{115BC}-\x{115BD}\x{115BF}-\x{115C0}\x{115DC}-\x{115DD}\x{11633}-\x{1163A}\x{1163D}\x{1163F}-\x{11640}\x{116AB}\x{116AD}\x{116B0}-\x{116B5}\x{116B7}\x{1171D}-\x{1171F}\x{11722}-\x{11725}\x{11727}-\x{1172B}\x{1182F}-\x{11837}\x{11839}-\x{1183A}\x{11A01}-\x{11A0A}\x{11A33}-\x{11A38}\x{11A3B}-\x{11A3E}\x{11A47}\x{11A51}-\x{11A56}\x{11A59}-\x{11A5B}\x{11A8A}-\x{11A96}\x{11A98}-\x{11A99}\x{11C30}-\x{11C36}\x{11C38}-\x{11C3D}\x{11C3F}\x{11C92}-\x{11CA7}\x{11CAA}-\x{11CB0}\x{11CB2}-\x{11CB3}\x{11CB5}-\x{11CB6}\x{11D31}-\x{11D36}\x{11D3A}\x{11D3C}-\x{11D3D}\x{11D3F}-\x{11D45}\x{11D47}\x{11D90}-\x{11D91}\x{11D95}\x{11D97}\x{11EF3}-\x{11EF4}\x{16AF0}-\x{16AF4}\x{16B30}-\x{16B36}\x{16B40}-\x{16B43}\x{16F8F}-\x{16F92}\x{16F93}-\x{16F9F}\x{16FE0}-\x{16FE1}\x{1BC9D}-\x{1BC9E}\x{1BCA0}-\x{1BCA3}\x{1D167}-\x{1D169}\x{1D173}-\x{1D17A}\x{1D17B}-\x{1D182}\x{1D185}-\x{1D18B}\x{1D1AA}-\x{1D1AD}\x{1D242}-\x{1D244}\x{1DA00}-\x{1DA36}\x{1DA3B}-\x{1DA6C}\x{1DA75}\x{1DA84}\x{1DA9B}-\x{1DA9F}\x{1DAA1}-\x{1DAAF}\x{1E000}-\x{1E006}\x{1E008}-\x{1E018}\x{1E01B}-\x{1E021}\x{1E023}-\x{1E024}\x{1E026}-\x{1E02A}\x{1E8D0}-\x{1E8D6}\x{1E944}-\x{1E94A}\x{1F3FB}-\x{1F3FF}\x{E0001}\x{E0020}-\x{E007F}\x{E0100}-\x{E01EF}])(\pL)(\pL*+)/u';
+    return preg_replace_callback($regex, function($s) {
+      return mb_strtoupper($s[1]) . $s[2];
+    }, $text);
   }
 
 }

src/Plugin/token_modifier/UpperCase.php

@@ -19,7 +19,7 @@ class UpperCase extends TokenModifierPluginBase {
    * {@inheritdoc}
    */
   public function transform(string $text, array $data = [], array $options = []) {
-    return strtoupper($this->token->replace($text, $data, $options));
+    return mb_strtoupper($this->token->replace($text, $data, $options));
   }
 
 }

src/Plugin/token_modifier/UpperCaseFirst.php

@@ -16,7 +16,14 @@ use Drupal\token_modifier\Plugin\TokenModifierPluginBase;
 class UpperCaseFirst extends TokenModifierPluginBase {
 
   public function transform(string $text, array $data = [], array $options = []) {
-    return ucfirst($this->token->replace($text, $data, $options));
+    return $this->mb_ucfirst($this->token->replace($text, $data, $options));
+  }
+
+  protected function mb_ucfirst(string $text): array|string|null {
+    $regex = '/(?<![\x{0027}\x{002E}\x{003A}\x{005E}\x{0060}\x{00A8}\x{00AD}\x{00AF}\x{00B4}\x{00B7}\x{00B8}\x{02B0}-\x{02C1}\x{02C2}-\x{02C5}\x{02C6}-\x{02D1}\x{02D2}-\x{02DF}\x{02E0}-\x{02E4}\x{02E5}-\x{02EB}\x{02EC}\x{02ED}\x{02EE}\x{02EF}-\x{02FF}\x{0300}-\x{036F}\x{0374}\x{0375}\x{037A}\x{0384}-\x{0385}\x{0387}\x{0483}-\x{0487}\x{0488}-\x{0489}\x{0559}\x{0591}-\x{05BD}\x{05BF}\x{05C1}-\x{05C2}\x{05C4}-\x{05C5}\x{05C7}\x{05F4}\x{0600}-\x{0605}\x{0610}-\x{061A}\x{061C}\x{0640}\x{064B}-\x{065F}\x{0670}\x{06D6}-\x{06DC}\x{06DD}\x{06DF}-\x{06E4}\x{06E5}-\x{06E6}\x{06E7}-\x{06E8}\x{06EA}-\x{06ED}\x{070F}\x{0711}\x{0730}-\x{074A}\x{07A6}-\x{07B0}\x{07EB}-\x{07F3}\x{07F4}-\x{07F5}\x{07FA}\x{07FD}\x{0816}-\x{0819}\x{081A}\x{081B}-\x{0823}\x{0824}\x{0825}-\x{0827}\x{0828}\x{0829}-\x{082D}\x{0859}-\x{085B}\x{08D3}-\x{08E1}\x{08E2}\x{08E3}-\x{0902}\x{093A}\x{093C}\x{0941}-\x{0948}\x{094D}\x{0951}-\x{0957}\x{0962}-\x{0963}\x{0971}\x{0981}\x{09BC}\x{09C1}-\x{09C4}\x{09CD}\x{09E2}-\x{09E3}\x{09FE}\x{0A01}-\x{0A02}\x{0A3C}\x{0A41}-\x{0A42}\x{0A47}-\x{0A48}\x{0A4B}-\x{0A4D}\x{0A51}\x{0A70}-\x{0A71}\x{0A75}\x{0A81}-\x{0A82}\x{0ABC}\x{0AC1}-\x{0AC5}\x{0AC7}-\x{0AC8}\x{0ACD}\x{0AE2}-\x{0AE3}\x{0AFA}-\x{0AFF}\x{0B01}\x{0B3C}\x{0B3F}\x{0B41}-\x{0B44}\x{0B4D}\x{0B56}\x{0B62}-\x{0B63}\x{0B82}\x{0BC0}\x{0BCD}\x{0C00}\x{0C04}\x{0C3E}-\x{0C40}\x{0C46}-\x{0C48}\x{0C4A}-\x{0C4D}\x{0C55}-\x{0C56}\x{0C62}-\x{0C63}\x{0C81}\x{0CBC}\x{0CBF}\x{0CC6}\x{0CCC}-\x{0CCD}\x{0CE2}-\x{0CE3}\x{0D00}-\x{0D01}\x{0D3B}-\x{0D3C}\x{0D41}-\x{0D44}\x{0D4D}\x{0D62}-\x{0D63}\x{0DCA}\x{0DD2}-\x{0DD4}\x{0DD6}\x{0E31}\x{0E34}-\x{0E3A}\x{0E46}\x{0E47}-\x{0E4E}\x{0EB1}\x{0EB4}-\x{0EB9}\x{0EBB}-\x{0EBC}\x{0EC6}\x{0EC8}-\x{0ECD}\x{0F18}-\x{0F19}\x{0F35}\x{0F37}\x{0F39}\x{0F71}-\x{0F7E}\x{0F80}-\x{0F84}\x{0F86}-\x{0F87}\x{0F8D}-\x{0F97}\x{0F99}-\x{0FBC}\x{0FC6}\x{102D}-\x{1030}\x{1032}-\x{1037}\x{1039}-\x{103A}\x{103D}-\x{103E}\x{1058}-\x{1059}\x{105E}-\x{1060}\x{1071}-\x{1074}\x{1082}\x{1085}-\x{1086}\x{108D}\x{109D}\x{10FC}\x{135D}-\x{135F}\x{1712}-\x{1714}\x{1732}-\x{1734}\x{1752}-\x{1753}\x{1772}-\x{1773}\x{17B4}-\x{17B5}\x{17B7}-\x{17BD}\x{17C6}\x{17C9}-\x{17D3}\x{17D7}\x{17DD}\x{180B}-\x{180D}\x{180E}\x{1843}\x{1885}-\x{1886}\x{18A9}\x{1920}-\x{1922}\x{1927}-\x{1928}\x{1932}\x{1939}-\x{193B}\x{1A17}-\x{1A18}\x{1A1B}\x{1A56}\x{1A58}-\x{1A5E}\x{1A60}\x{1A62}\x{1A65}-\x{1A6C}\x{1A73}-\x{1A7C}\x{1A7F}\x{1AA7}\x{1AB0}-\x{1ABD}\x{1ABE}\x{1B00}-\x{1B03}\x{1B34}\x{1B36}-\x{1B3A}\x{1B3C}\x{1B42}\x{1B6B}-\x{1B73}\x{1B80}-\x{1B81}\x{1BA2}-\x{1BA5}\x{1BA8}-\x{1BA9}\x{1BAB}-\x{1BAD}\x{1BE6}\x{1BE8}-\x{1BE9}\x{1BED}\x{1BEF}-\x{1BF1}\x{1C2C}-\x{1C33}\x{1C36}-\x{1C37}\x{1C78}-\x{1C7D}\x{1CD0}-\x{1CD2}\x{1CD4}-\x{1CE0}\x{1CE2}-\x{1CE8}\x{1CED}\x{1CF4}\x{1CF8}-\x{1CF9}\x{1D2C}-\x{1D6A}\x{1D78}\x{1D9B}-\x{1DBF}\x{1DC0}-\x{1DF9}\x{1DFB}-\x{1DFF}\x{1FBD}\x{1FBF}-\x{1FC1}\x{1FCD}-\x{1FCF}\x{1FDD}-\x{1FDF}\x{1FED}-\x{1FEF}\x{1FFD}-\x{1FFE}\x{200B}-\x{200F}\x{2018}\x{2019}\x{2024}\x{2027}\x{202A}-\x{202E}\x{2060}-\x{2064}\x{2066}-\x{206F}\x{2071}\x{207F}\x{2090}-\x{209C}\x{20D0}-\x{20DC}\x{20DD}-\x{20E0}\x{20E1}\x{20E2}-\x{20E4}\x{20E5}-\x{20F0}\x{2C7C}-\x{2C7D}\x{2CEF}-\x{2CF1}\x{2D6F}\x{2D7F}\x{2DE0}-\x{2DFF}\x{2E2F}\x{3005}\x{302A}-\x{302D}\x{3031}-\x{3035}\x{303B}\x{3099}-\x{309A}\x{309B}-\x{309C}\x{309D}-\x{309E}\x{30FC}-\x{30FE}\x{A015}\x{A4F8}-\x{A4FD}\x{A60C}\x{A66F}\x{A670}-\x{A672}\x{A674}-\x{A67D}\x{A67F}\x{A69C}-\x{A69D}\x{A69E}-\x{A69F}\x{A6F0}-\x{A6F1}\x{A700}-\x{A716}\x{A717}-\x{A71F}\x{A720}-\x{A721}\x{A770}\x{A788}\x{A789}-\x{A78A}\x{A7F8}-\x{A7F9}\x{A802}\x{A806}\x{A80B}\x{A825}-\x{A826}\x{A8C4}-\x{A8C5}\x{A8E0}-\x{A8F1}\x{A8FF}\x{A926}-\x{A92D}\x{A947}-\x{A951}\x{A980}-\x{A982}\x{A9B3}\x{A9B6}-\x{A9B9}\x{A9BC}\x{A9CF}\x{A9E5}\x{A9E6}\x{AA29}-\x{AA2E}\x{AA31}-\x{AA32}\x{AA35}-\x{AA36}\x{AA43}\x{AA4C}\x{AA70}\x{AA7C}\x{AAB0}\x{AAB2}-\x{AAB4}\x{AAB7}-\x{AAB8}\x{AABE}-\x{AABF}\x{AAC1}\x{AADD}\x{AAEC}-\x{AAED}\x{AAF3}-\x{AAF4}\x{AAF6}\x{AB5B}\x{AB5C}-\x{AB5F}\x{ABE5}\x{ABE8}\x{ABED}\x{FB1E}\x{FBB2}-\x{FBC1}\x{FE00}-\x{FE0F}\x{FE13}\x{FE20}-\x{FE2F}\x{FE52}\x{FE55}\x{FEFF}\x{FF07}\x{FF0E}\x{FF1A}\x{FF3E}\x{FF40}\x{FF70}\x{FF9E}-\x{FF9F}\x{FFE3}\x{FFF9}-\x{FFFB}\x{101FD}\x{102E0}\x{10376}-\x{1037A}\x{10A01}-\x{10A03}\x{10A05}-\x{10A06}\x{10A0C}-\x{10A0F}\x{10A38}-\x{10A3A}\x{10A3F}\x{10AE5}-\x{10AE6}\x{10D24}-\x{10D27}\x{10F46}-\x{10F50}\x{11001}\x{11038}-\x{11046}\x{1107F}-\x{11081}\x{110B3}-\x{110B6}\x{110B9}-\x{110BA}\x{110BD}\x{110CD}\x{11100}-\x{11102}\x{11127}-\x{1112B}\x{1112D}-\x{11134}\x{11173}\x{11180}-\x{11181}\x{111B6}-\x{111BE}\x{111C9}-\x{111CC}\x{1122F}-\x{11231}\x{11234}\x{11236}-\x{11237}\x{1123E}\x{112DF}\x{112E3}-\x{112EA}\x{11300}-\x{11301}\x{1133B}-\x{1133C}\x{11340}\x{11366}-\x{1136C}\x{11370}-\x{11374}\x{11438}-\x{1143F}\x{11442}-\x{11444}\x{11446}\x{1145E}\x{114B3}-\x{114B8}\x{114BA}\x{114BF}-\x{114C0}\x{114C2}-\x{114C3}\x{115B2}-\x{115B5}\x{115BC}-\x{115BD}\x{115BF}-\x{115C0}\x{115DC}-\x{115DD}\x{11633}-\x{1163A}\x{1163D}\x{1163F}-\x{11640}\x{116AB}\x{116AD}\x{116B0}-\x{116B5}\x{116B7}\x{1171D}-\x{1171F}\x{11722}-\x{11725}\x{11727}-\x{1172B}\x{1182F}-\x{11837}\x{11839}-\x{1183A}\x{11A01}-\x{11A0A}\x{11A33}-\x{11A38}\x{11A3B}-\x{11A3E}\x{11A47}\x{11A51}-\x{11A56}\x{11A59}-\x{11A5B}\x{11A8A}-\x{11A96}\x{11A98}-\x{11A99}\x{11C30}-\x{11C36}\x{11C38}-\x{11C3D}\x{11C3F}\x{11C92}-\x{11CA7}\x{11CAA}-\x{11CB0}\x{11CB2}-\x{11CB3}\x{11CB5}-\x{11CB6}\x{11D31}-\x{11D36}\x{11D3A}\x{11D3C}-\x{11D3D}\x{11D3F}-\x{11D45}\x{11D47}\x{11D90}-\x{11D91}\x{11D95}\x{11D97}\x{11EF3}-\x{11EF4}\x{16AF0}-\x{16AF4}\x{16B30}-\x{16B36}\x{16B40}-\x{16B43}\x{16F8F}-\x{16F92}\x{16F93}-\x{16F9F}\x{16FE0}-\x{16FE1}\x{1BC9D}-\x{1BC9E}\x{1BCA0}-\x{1BCA3}\x{1D167}-\x{1D169}\x{1D173}-\x{1D17A}\x{1D17B}-\x{1D182}\x{1D185}-\x{1D18B}\x{1D1AA}-\x{1D1AD}\x{1D242}-\x{1D244}\x{1DA00}-\x{1DA36}\x{1DA3B}-\x{1DA6C}\x{1DA75}\x{1DA84}\x{1DA9B}-\x{1DA9F}\x{1DAA1}-\x{1DAAF}\x{1E000}-\x{1E006}\x{1E008}-\x{1E018}\x{1E01B}-\x{1E021}\x{1E023}-\x{1E024}\x{1E026}-\x{1E02A}\x{1E8D0}-\x{1E8D6}\x{1E944}-\x{1E94A}\x{1F3FB}-\x{1F3FF}\x{E0001}\x{E0020}-\x{E007F}\x{E0100}-\x{E01EF}])(\pL)([\s\S]*)/u';
+    return preg_replace_callback($regex, function($s) {
+      return mb_strtoupper($s[1]) . $s[2];
+    }, $text);
   }
 
 }

tests/src/Unit/LowercaseTest.php

@@ -31,6 +31,7 @@ class LowercaseTest extends TokenModifierTestCase {
     $data['basic'] = ['Hello World!', 'hello world!'];
     $data['already lowercased'] = ['working?', 'working?'];
     $data['capitalised'] = ['CAPITALISED', 'capitalised'];
+    $data['multibyte'] = ['AČIŪ', 'ačiū'];
     return $data;
   }
 

tests/src/Unit/TitleCaseTest.php

@@ -31,6 +31,7 @@ class TitleCaseTest extends TokenModifierTestCase {
     $data['basic'] = ['hello world!', 'Hello World!'];
     $data['already capitalised'] = ['It\'s Working?', 'It\'s Working?'];
     $data['everything else capitalised'] = ['cAPITALISE eVERYTHING', 'CAPITALISE EVERYTHING'];
+    $data['multibyte'] = ['čhecking multibyte ūnderway...', 'Čhecking Multibyte Ūnderway...'];
     return $data;
   }
 

tests/src/Unit/UpperCaseFirstTest.php

@@ -31,6 +31,7 @@ class UpperCaseFirstTest extends TokenModifierTestCase {
     $data['basic'] = ['hello world!', 'Hello world!'];
     $data['already capitalised'] = ['Working?', 'Working?'];
     $data['everything else capitalised'] = ['cAPITALISE', 'CAPITALISE'];
+    $data['multibyte'] = ['čhecking multibyte ūnderway...', 'Čhecking multibyte ūnderway...'];
     return $data;
   }
 

tests/src/Unit/UpperCaseTest.php

@@ -31,6 +31,7 @@ class UpperCaseTest extends TokenModifierTestCase {
     $data['basic'] = ['hello world!', 'HELLO WORLD!'];
     $data['already capitalised'] = ['WORKING?', 'WORKING?'];
     $data['camel case'] = ['cApItAlIsE', 'CAPITALISE'];
+    $data['multibyte'] = ['ačiū', 'AČIŪ'];
     return $data;
   }