Regular verification of two decimal places

One 、 Two decimal places

 /^(([1-9]{1}\d*)|(0{1}))(\.\d{1,2})?$/

Two 、 Less than or equal to 100 Decimal regularity of

/^(100|([1-9][0-9]?)|(0|[1-9][0-9]?)(?:\.\d{0,2}))?$/

Reading ：

^： Matches the start of the input string , What does it start with

$： Matches the end of the input string , What does it end with

*： Match previous subexpression zero or more times

?： Match previous subexpression zero or once

{n}：n Is a non negative integer . Matched definite n Time

{n,m}：m and n All non negative integers , among n <= m. Least match n Times and at most m Time

\d： Matches a numeric character

x|y： matching x or y

[a-z]： character in range . Matches any character in the specified range .