正则表达式不限制小数点后的值

Question

My text field should accept values between 0.00 and 0.99 and I have the following regex

^0.\.*[0,9]{0,2}$

But its not limiting the values after decimal point.Can someone guide me to fix it.

Answer 1

The correct code for that is

^0\.[0-9]{1,2}$

The errors in your expression are that

1) [0,9] is not a range. It means that the characters 0 , , and 9 can be matched at the end of the string.

2) 0.\\.* means that any single-character may be matched if it comes after a 0 and before a dot . Including alphabetic characters.

To debug in an easier way, try online testers, such as http://www.regextester.com/

Answer 2

This should work:

^0\.\d{0,2}$

• ^ Look for start of line
• 0\\. Look for 0.
• \\d{0,2} Look for a digit between 0 and 2 times
• $ Look for end of line