regex - Detect if string is number or has decimal value in javascript - Stack Overflow

admin管理员组

文章数量:1332873

I need users to enter an amount and this may e in different formats like 500 or 500.00. So I need to check if the user has entered a number or a number with two decimal points. SO far I have tried

if(/^\d+$/.test(amount) === false || /[0-9]+(\.[0-9][0-9]?)?/.test(amount) === false){
          //valid
}else{
         //invalid
}

But so far only the one to check if it is a number is working fine.

I need users to enter an amount and this may e in different formats like 500 or 500.00. So I need to check if the user has entered a number or a number with two decimal points. SO far I have tried

if(/^\d+$/.test(amount) === false || /[0-9]+(\.[0-9][0-9]?)?/.test(amount) === false){
          //valid
}else{
         //invalid
}

But so far only the one to check if it is a number is working fine.

• javascript
• regex

Share Improve this question Follow asked May 4, 2013 at 16:59 AmanniAmanni 1,93466 gold badges3131 silver badges5252 bronze badges 1

• 1 You want to check that either one of the checks pass, right? Change the falses to true. – JJJ Commented May 4, 2013 at 17:02

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 7

I guess you are looking for this

var pattern=/^\d+(\.\d{2})?$/;
if(pattern.test(amount))
{
          //valid number pattern
}
else
{
         //invalid number pattern
}

---

\d+(\.\d{2})?$ would match 1 to many digits optionally followed by two decimal values..

本文标签： regexDetect if string is number or has decimal value in javascriptStack Overflow