diff --git a/src/common/text/core/syntax-highlighter.js b/src/common/text/core/syntax-highlighter.js
index 61237daf6..06c59777e 100644
--- a/src/common/text/core/syntax-highlighter.js
+++ b/src/common/text/core/syntax-highlighter.js
@@ -189,6 +189,7 @@ const elements = [
 		}
 		
 		if (thisIsNotARegexp) return null;
+		if (regexp == '') return null;
 		if (regexp[0] == ' ' && regexp[regexp.length - 1] == ' ') return null;
 
 		return {
diff --git a/test/text.ts b/test/text.ts
index 19f652576..64247953b 100644
--- a/test/text.ts
+++ b/test/text.ts
@@ -5,7 +5,7 @@
 const assert = require('assert');
 
 const analyze = require('../src/common/text');
-//const compile = require('../src/web/app/common/scripts/text-compiler');
+const syntaxhighlighter = require('../src/common/text/core/syntax-highlighter');
 
 describe('Text', () => {
 	it('is correctly analyzed', () => {
@@ -59,4 +59,16 @@ describe('Text', () => {
 		assert.equal(tokens[0].type, 'inline-code');
 		assert.equal(tokens[0].content, '`var x = "Strawberry Pasta";`');
 	});
+
+	describe('syntax highlighting', () => {
+		it('regexp', () => {
+			const html = syntaxhighlighter('/.*/');
+			assert.equal(html, '<span class="regexp">/.*/</span>');
+		});
+
+		it('slash', () => {
+			const html = syntaxhighlighter('/');
+			assert.equal(html, '<span class="symbol">/</span>');
+		});
+	});
 });