diff --git a/src/utils.ts b/src/utils.ts
index 9c6727a..a8a9f63 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -82,8 +82,8 @@ export function* split(n: number, from: number = 2, to: number = 6) {
 
 export function toNumber(value: any): number | undefined {
     const normalized = String(value)
-        .replace('−‭', '-')
-        .replace(/[^0-9-]/gi, '');
+        .replace('\u2212', '\u002d') // minus to hyphen-minus
+        .replace(/[^0-9\u002d]/g, '');
     const converted = Number(normalized);
     return isNaN(converted) ? undefined : converted;
 }
diff --git a/tests/UtilsTest.ts b/tests/UtilsTest.ts
new file mode 100644
index 0000000..5b7df9d
--- /dev/null
+++ b/tests/UtilsTest.ts
@@ -0,0 +1,25 @@
+import { it, describe } from 'mocha';
+import { expect } from 'chai';
+import { getNumber } from '../src/utils';
+
+describe('Utils', function() {
+    it('Can parse positive number', function() {
+        const text = '123';
+        expect(getNumber(text)).to.be.equals(123);
+    });
+
+    it('Can parse positive number with noise', function() {
+        const text = '  123 ';
+        expect(getNumber(text)).to.be.equals(123);
+    });
+
+    it('Can parse negative number', function() {
+        const text = '-‭146';
+        expect(getNumber(text)).to.be.equals(-146);
+    });
+
+    it('Can parse negative number with minus sign', function() {
+        const text = '\u2212132';
+        expect(getNumber(text)).to.be.equals(-132);
+    });
+});