RegEx for currency (JavaScript)

Question

I am new to regular expressions and i would like to validate user input with javascript.

The user input is a currency, but i want it without the thousands commata.

Valid

"12.34"
"12,34"
"1234,5"
"123"
"123,00"
"12000"

Invalid

"12a34"
"abc"
"12.000,00"
"12,000.00"

I tried the following regex-pattern, but it doesnt work for me. it validates for example "12a34" and i dont know why.

/\d+([\.|\,]\d+)?/

What would be the correct regex-pattern ? Could you explain this step by step ?

Thanks !

possible duplicate of Javascript regular expression for currency format — Aditya Singh
– Aditya Singh, Commented Nov 20, 2013 at 9:30

Christoph · Accepted Answer · 2013-11-20 09:39:27Z

3

Do not escape the . while in a character group. Try with following regex:

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

^   = start of string
$   = end of string
()? = an optional capturegroup ( e.g. to validate "123")
{x,y} = The symbol may occur minimum x and maximum y times

edited Nov 20, 2013 at 9:39

Christoph

51.4k22 gold badges103 silver badges129 bronze badges

answered Nov 20, 2013 at 9:29

hsz

153k63 gold badges268 silver badges320 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

user1587021 Over a year ago

Thanks, this works for me. What does the ^ and the $ mean for this pattern ?

hsz Over a year ago

^ means that you are matching regex from the first character of the string and $ to the end. Without it, regex can match just a part of the string.

Teneff Over a year ago

+1 just to mention that if you want to match up to 2 digits after the decimal point you can use \d{1,2} instead of \d+

user1587021 Over a year ago

Thanks for updating the answer, really helps me understanding regex!

Pir Abdul · Accepted Answer · 2013-11-20 10:10:09Z

-1

RegExp: /^(?!\(.*[^)]$|[^(].*\)$)\(?\$?(0|[1-9]\d{0,2}(,?\d{3})?)(\.\d\d?)?\)?$/g
pattern: ^(?!\(.*[^)]$|[^(].*\)$)\(?\$?(0|[1-9]\d{0,2}(,?\d{3})?)(\.\d\d?)?\)?$
flags: g
3 capturing groups: 
   group 1: (0|[1-9]\d{0,2}(,?\d{3})?)
   group 2: (,?\d{3})
   group 3: (\.\d\d?)

Regex Test

edited Nov 20, 2013 at 10:10

answered Nov 20, 2013 at 9:33

Pir Abdul

2,3721 gold badge28 silver badges35 bronze badges

2 Comments

Christoph Over a year ago

Links rot - and then your answer is useless.

SQB Over a year ago

In other words, give an answer here. You can also provide a link to a fiddle or test site, but that other site is not going to be around forever. Answers (and examples and questions as well!) should be self-contained.

Collectives™ on Stack Overflow

RegEx for currency (JavaScript)

2 Answers 2

4 Comments

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related