REGEX丢弃浮点数和前导零

Question

I have a Regex expression which should allow only positive number except zero and floating numbers ^0*[1-9][0-9]*(\\.[0-9]+)?|0+\\.[0-9]*[1-9][0-9]*$ but it is allowing floating numbers, can anyone modify this and let me know the regex

valid:

1-any number 
01 - any number

not valid:

00 - any leading zeros
0
1.4 - floating numbers
abc - alphabets 
-1 - negative numbers

Answer 1

Try this pattern [0]*[1-9][0-9]* as:

String str = "00012";
str.matches("[0]*[1-9][0-9]*");

Where:

[0]* is any number of 0 at start of the string

[1-9] one digit from 1 to 9

and [0-9]* any number of digits from 0 to 9

If you want to use it with JavaScript, just modify it with ^ and $ to determine the start and the end of the string like:

^[0]*[1-9][0-9]*$

Answer 2

Stanislav's regex (see below) I think matches what you want. Upvote him if you agree! (Note: you may need to wrap it in ^ and $ so it matches the beginning and end of the string, like this: ^[0]*[1-9][0-9]*$ ) You can test it here:

 /* https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Forms/Data_form_validation */ input:invalid { border: 5px solid red; } 

 <input pattern="[0]*[1-9][0-9]*">