Fix bug with non-latin languages.

- Fix: When $wgCapitalLinks was true, the extension would not work with non-latin languages.

Closes #7.

README.md

@@ -31,6 +31,7 @@ Contributors
 - Daniel Kraus (@bovender), main developer
 - Ulrich Strauss (@c0nnex), namespaces
 - Brent Laabs (@labster), code review and bug fixes
+- @tetsuya-zama, bug fix
 
 
 Testing

extension.json

@@ -3,7 +3,8 @@
         "author": [
                 "[https://www.mediawiki.org/wiki/User:Bovender Daniel Kraus (bovender)]",
                 "Ulrich Strauss (c0nnex)",
-                "Brent Laabs (labster)"
+                "Brent Laabs (labster)",
+                "tetsuya-zama"
         ],
         "type": "parserhook",
         "url": "https://www.mediawiki.org/wiki/Extension:LinkTitles",

includes/Target.php

@@ -139,7 +139,7 @@ class Target {
 	public function getCaseSensitiveLinkValueRegex() {
 		if ( $this->caseSensitiveLinkValueRegex === null ) {
 			$regexSafeTitle = $this->getRegexSafeTitle();
-			if ( $this->config->capitalLinks && ( $regexSafeTitle[0] != '\\' )) {
+			if ( $this->config->capitalLinks && preg_match( '/[a-zA-Z]/', $regexSafeTitle[0] ) ) {
 				$this->caseSensitiveLinkValueRegex = '((?i)' . $regexSafeTitle[0] . '(?-i)' . substr($regexSafeTitle, 1) . ')';
 			}	else {
 				$this->caseSensitiveLinkValueRegex = '(' . $regexSafeTitle . ')';