CODEWITHSUNDEEP
javascriptregex
Weblurk
Weblurk

Reputation: 6812

How can I check if a string contains only numbers, comma and periods with regex in javascript?

I have an input field that I will only accept numbers, commas and periods. How can I test if the string is valid according to these rules?

I have tried the following: 

var isValid = /([0-9][,][.])$/.test(str);

but it's not working. isValid variable is always false.

Upvotes: 12

Views: 36257

Answers (2)

Justin Patel
Justin Patel

Reputation: 1443

var regex = "[-+]?[0-9]*\.?[0-9]*"

This works perfect for decimal number & Integer. e.g.

1 - true
1.1 - true
1.1.1 - false
1.a - false

Upvotes: 0

Tibos
Tibos

Reputation: 27833

Your regexp expects one character from the first class (0-9), then one from the second class (comma) then one from the last class (dot). Instead you want any number of characters (*) from the class containing digits, commas and dots ([0-9,.]). Also, you don't need the parenthesis:

var isValid = /^[0-9,.]*$/.test(str);

DEMO (and explanation): http://regex101.com/r/yK6oF4

Upvotes: 30

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