Regex for decimal input in Javascript having 1 to 3 digits before decimal and 1 to 3 digits after decimal

Question

I wanted to create a Javascript regex, which accepts

123, 123.123, 12.34, 1.324

But should not accept

1246, 1234.45, 1.2364

Answer 1

试试这个正则表达式：

/^[0-9]{1,3}(\.[0-9]{1,3})?$/

Answer 2

尝试这个

/^\d{1,3}(\.\d{1,3})?$/

Answer 3

Try this one:

/^(0|[1-9]\\d?\\d?)(\\.\\d{1,3})?$/

I assume "00" or "01.234" should not be valid. Use the other answers if they should. :)