diff --git a/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigRegExp.java b/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigRegExp.java
index d6956e8a..ec07f24d 100644
--- a/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigRegExp.java
+++ b/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigRegExp.java
@@ -25,7 +25,7 @@
 import org.eclipse.jdt.annotation.Nullable;
 import org.eclipse.tm4e.core.TMException;
 import org.eclipse.tm4e.core.internal.utils.StringUtils;
-import org.jcodings.specific.UTF8Encoding;
+import org.jcodings.specific.NonStrictUTF8Encoding;
 import org.joni.Matcher;
 import org.joni.Option;
 import org.joni.Regex;
@@ -88,7 +88,7 @@ private Regex parsePattern(final String pattern, final boolean ignoreCase) throw
 		if (ignoreCase)
 			options |= Option.IGNORECASE;
 		final byte[] patternBytes = pattern.getBytes(StandardCharsets.UTF_8);
-		return new Regex(patternBytes, 0, patternBytes.length, options, UTF8Encoding.INSTANCE, Syntax.DEFAULT,
+		return new Regex(patternBytes, 0, patternBytes.length, options, NonStrictUTF8Encoding.INSTANCE, Syntax.RUBY,
 				LOGGER.isLoggable(Level.WARNING) ? LOGGER_WARN_CALLBACK : WarnCallback.NONE);
 	}