正则表达式，读取以xx.5结尾的整数和十进制数

Question

how to write a regular expression so that it accepts only whole numbers and decimal ending with .5. I try the following but it reads only 0.5 and whole numbers. I want it to read any number ending with '.5'.

^0\.5|\d+$

Thanks in Advance

Answer 1

Try the following:

^\d+(\.5)?$

The problem with your regex is that it only matches 0 in the start of the string in case the .5 is also matched.

Answer 2

这应该可以解决问题：

^\d+(\.5)?$