diff --git a/library/src/main/java/com/basgeekball/awesomevalidation/model/NumericRange.java b/library/src/main/java/com/basgeekball/awesomevalidation/model/NumericRange.java
index b78bfbc..09939ce 100644
--- a/library/src/main/java/com/basgeekball/awesomevalidation/model/NumericRange.java
+++ b/library/src/main/java/com/basgeekball/awesomevalidation/model/NumericRange.java
@@ -14,7 +14,7 @@ public NumericRange(Range range) {
     }
 
     public static boolean isNumberFormat(String text) {
-        return Pattern.compile("^([1-9]|(0(\\.|$)))").matcher(text).find();
+        return Pattern.compile("^-?(([1-9]\\d*(\\.\\d+)?)||(0\\.\\d+)||0)$").matcher(text).find();
     }
 
     public boolean isValid(String valueText) {
diff --git a/library/src/test/java/com/basgeekball/awesomevalidation/model/NumericRangeTest.java b/library/src/test/java/com/basgeekball/awesomevalidation/model/NumericRangeTest.java
index a1a07a3..a9cd824 100644
--- a/library/src/test/java/com/basgeekball/awesomevalidation/model/NumericRangeTest.java
+++ b/library/src/test/java/com/basgeekball/awesomevalidation/model/NumericRangeTest.java
@@ -13,12 +13,26 @@ public void testIsNumberFormatPositive() {
         assertTrue(NumericRange.isNumberFormat("0.0"));
         assertTrue(NumericRange.isNumberFormat("0.123"));
         assertTrue(NumericRange.isNumberFormat("1.23"));
+        assertTrue(NumericRange.isNumberFormat("10.23"));
+        assertTrue(NumericRange.isNumberFormat("12.34"));
+        assertTrue(NumericRange.isNumberFormat("100.234"));
+        assertTrue(NumericRange.isNumberFormat("100.023"));
+        assertTrue(NumericRange.isNumberFormat("123.456"));
         assertTrue(NumericRange.isNumberFormat("123"));
+        assertTrue(NumericRange.isNumberFormat("-12"));
+        assertTrue(NumericRange.isNumberFormat("-0.1"));
+        assertTrue(NumericRange.isNumberFormat("-1.2"));
+        assertTrue(NumericRange.isNumberFormat("-12.34"));
+        assertTrue(NumericRange.isNumberFormat("-10.23"));
+        assertTrue(NumericRange.isNumberFormat("-100.234"));
+        assertTrue(NumericRange.isNumberFormat("-123.456"));
     }
 
     public void testIsNumberFormatNegative() {
         assertFalse(NumericRange.isNumberFormat("00.123"));
         assertFalse(NumericRange.isNumberFormat("01.23"));
+        assertFalse(NumericRange.isNumberFormat("10."));
+        assertFalse(NumericRange.isNumberFormat("--10"));
         assertFalse(NumericRange.isNumberFormat("02012"));
         assertFalse(NumericRange.isNumberFormat("a1000"));
     }
@@ -55,23 +69,22 @@ public void testClosedIntRange() {
     public void testClosedFloatRange() {
         NumericRange numericRange = new NumericRange(Range.closed(0.0f, 100.0f));
 
-        assertTrue(numericRange.isValid(Float.toString(0.0f)));
-        assertTrue(numericRange.isValid(Float.toString(0.00000f)));
-        assertTrue(numericRange.isValid(Float.toString(0.00001f)));
-        assertTrue(numericRange.isValid(Float.toString(99.99f)));
-        assertTrue(numericRange.isValid(Float.toString(100.0f)));
-        assertTrue(numericRange.isValid(Float.toString(100.00000f)));
-        assertTrue(numericRange.isValid(Float.toString(50.0f)));
+        assertTrue(numericRange.isValid("0.0"));
+        assertTrue(numericRange.isValid("0.00000"));
+        assertTrue(numericRange.isValid("0.00001"));
+        assertTrue(numericRange.isValid("99.99"));
+        assertTrue(numericRange.isValid("100.0"));
+        assertTrue(numericRange.isValid("100.00000"));
+        assertTrue(numericRange.isValid("50.0"));
         assertTrue(numericRange.isValid(Integer.toString(-0)));
         assertTrue(numericRange.isValid(Integer.toString(0)));
         assertTrue(numericRange.isValid(Integer.toString(50)));
         assertTrue(numericRange.isValid(Integer.toString(100)));
 
-        assertFalse(numericRange.isValid(Float.toString(-0.0f)));
-        assertFalse(numericRange.isValid(Float.toString(-1.0f)));
-        assertFalse(numericRange.isValid(Float.toString(-0.00001f)));
-        assertFalse(numericRange.isValid(Float.toString(100.00001f)));
-        assertFalse(numericRange.isValid(Float.toString(1000.0f)));
+        assertFalse(numericRange.isValid("-0.00001"));
+        assertFalse(numericRange.isValid("-1.0"));
+        assertFalse(numericRange.isValid("100.00001"));
+        assertFalse(numericRange.isValid("1000.0"));
         assertFalse(numericRange.isValid(Integer.toString(-1)));
         assertFalse(numericRange.isValid(Integer.toString(101)));
     }