Question

80

Regex to allow only a single dot in a textbox

rated 0 times [ 86] [ 6] / answers: 1 / hits: 20411 / 10 Years ago, thu, july 31, 2014, 12:00:00

I have one text input.

I wrote a regex for masking all special characters except . and -. Now if by mistake the user enters two . (dots) in input, then with the current regex

var valueTest='225..36'



valueTest.match(/[^-.d]/)

I expected that the number will not pass this condition

How to handle this case. I just want one . (dot) in input field since it is a number.

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

travion

Add To Favorites

Follow

Total Points: 137

Total Questions: 96

Total Answers: 103

Location: India

Member since Wed, Aug 4, 2021

3 Years ago

travion questions

1 Tagify set data in tagify input on click

Mon, Dec 16, 19, 00:00, 5 Years ago

1 Laravel - How to Import Vue Component to Another Component

Sat, Oct 19, 19, 00:00, 5 Years ago

1 Date conversion in react js

Fri, Sep 20, 19, 00:00, 5 Years ago

1 How can I style react semantic components?

Wed, Nov 14, 18, 00:00, 6 Years ago

1 Problem with onChange for Masked Input in React

Sun, Oct 28, 18, 00:00, 6 Years ago

View All

answered 10 Years ago harrisa · Accepted Answer

I think you mean this,

^-?d+(?:.d+)?$

DEMO

It allows positive and negative numbers with or without decimal points.

EXplanation:

^ Asserts that we are at the start.

-? Optional - symbol.

d+ Matches one or more numbers.

(?: start of non-capturing group.

. Matches a literal dot.

d+ Matches one or more numbers.

? Makes the whole non-capturing group as optional.

$ Asserts that we are at the end.