CODEWITHSUNDEEP
javascriptregex
user815460
user815460

Reputation: 1143

Use regex in Javascript to get cents

I am trying to formulate a regex expression in JavaScript to get the cents form a number that has a decimal point. For example, an expression that can get 27 from 454.2700000. I know how to do this with split and substring but is there an easier way using just a regular expression. Thanks

Upvotes: 1

Views: 1904

Answers (4)

kennebec
kennebec

Reputation: 104780

If you really have a number and you want a number, why use strings?

var n=454.27;
var cents=Math.round(n*100)%100;

If n is a numeric string, multiplication converts it to a number:

var n= '454.270000';
var cents=Math.round(n*100)%100;

Upvotes: 1

nickytonline
nickytonline

Reputation: 6981

You could do a regex test

/\.(\d+)$/.test(454.2700000)

and get your cents here, parseInt(RegExp.$1, 10). Parsing the integer strips the zeroes.

Or if you always want two decimal places, replace my \d+ with pimvbd's \d{2} and then you can just to RegExp.$1 without the parseInt.

You can see it here http://jsfiddle.net/nickyt/qbsfY

Upvotes: 0

pimvdb
pimvdb

Reputation: 154838

The following parses out two digits after the decimal point:

/\.(\d{2})/
  • \. means a dot
  • \d means a digit
  • {2} means two of them
  • () to capture this part of the match

To get the match, use .exec and [1]:

/\.(\d{2})/.exec("454.2700000")[1]; // "27"

Upvotes: 3

Pavel Podlipensky
Pavel Podlipensky

Reputation: 8269

The following regex will return you what you want:

/(?:\.)(\d\d)/.exec(454.2700000)[1]

Upvotes: 0

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