正则表达式模式只有一个点并匹配整数和十进制数

Question

I'm struggling with creating proper regex pattern to match such strings:

"3" // true
"3." // true
"3.1" // true
"3.22" // true

And such strings should fail matching:

"3.." // false
"3.222" // false

My current regex /^\\d+(\\.\\d{1,2})*$/ matches only decimal numbers. I've tried several updates to it but cannot accept all rules.

Answer 1

Make the decimal part optional + you forgot to put \\ before first d , and remove * from the decimal part.

/^\d+(\.\d{0,2})?$/
  ^             ^