CODEWITHSUNDEEP
regex
geoffs3310
geoffs3310

Reputation: 14008

RegEx needed to match number to exactly two decimal places

I need some regex that will match only numbers that are decimal to two places. For example:

Upvotes: 35

Views: 132751

Answers (5)

Grhm
Grhm

Reputation: 6834

If you're looking for an entire line match I'd go with Paul's answer.

If you're looking to match a number within a line try: \d+\.\d\d(?!\d)

  • \d+ One or more digits (same as [0-9])
  • \. Matches to period character
  • \d\d Matches the two decimal places
  • (?!\d) Is a negative lookahead that ensures the next character is not a digit.

Upvotes: 11

Chetan Buddh
Chetan Buddh

Reputation: 492

var regexp = /^[0-9]*(\.[0-9]{0,2})?$/;

//returns true
regexp.test('10.50')

//returns false
regexp.test('-120')

//returns true
regexp.test('120.35')

//returns true
regexp.test('120')

Upvotes: 32

Kailas
Kailas

Reputation: 3231

You can also try Regular Expression 

^\d+(\.\d{1,2})?$

or
var regexp = /^\d+\.\d{0,2}$/;

// returns true
regexp.test('10.5')

or
[0-9]{2}.[0-9]{2}

or
^[0-9]\d{0,9}(\.\d{1,3})?%?$

or
^\d{1,3}(\.\d{0,2})?$

Upvotes: 2

Martin Jespersen
Martin Jespersen

Reputation: 26183

It depends a bit on what shouldn't match and what should and in what context

for example should the text you test against only hold the number? in that case you could do this:

/^[0-9]+\.[0-9]{2}$/

but that will test the entire string and thus fail if the match should be done as part of a greater whole

if it needs to be inside a longer styring you could do

/[0-9]+\.[0-9]{2}[^0-9]/

but that will fail if the string is is only the number (since it will require a none-digit to follow the number)

if you need to be able to cover both cases you could use the following:

/^[0-9]+\.[0-9]{2}$|[0-9]+\.[0-9]{2}[^0-9]/

Upvotes: 5

Paul
Paul

Reputation: 3010

^[0-9]*\.[0-9]{2}$ or ^[0-9]*\.[0-9][0-9]$

Upvotes: 50

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