I want this string:
378282246310005
With a regex, I want to return groups of 4 characters, then the next 6, then the next 5. Like this:
3782 822463 10005
Edit
I also want to have partial matches, so this string:
378 will return 378
and
37822822 will return 3782 822
Read about matching digits and quantifiers.
\d is a shorthand character class matching one digit
{Min,Max} is matching at least Min and at most Max times. {x} is matching x times.
You would need also Anchors, either ^ and $ when the number is the complete string or wordboundaries \b before and ahead, when the number is somewhere in the text.
Then you need to capture the matched groups, to be able to retrive the result.
Then you end up here:
^(\d{4})(\d{6})(\d{5})$
Your numbers are then in the capturing groups 1, 2 and 3.
For your partial match requirement you can use this:
^(\d{1,4})(\d{0,6})(\d{0,5})$
See it here on Regexr
With respect to the partial matches requirement, I guess the regex you're looking for should be like this:
/(^\d{1,4})(?:(\d{1,6})(\d{1,5})?)?/
Test:
> r = /(^\d{1,4})(?:(\d{1,6})(\d{1,5})?)?/
> s = "378282246310005"
> while(s) { console.log(s.match(r)); s = s.substr(0, s.length - 1) }
["378282246310005", "3782", "822463", "10005", index: 0, input: "378282246310005"]
["37828224631000", "3782", "822463", "1000", index: 0, input: "37828224631000"]
["3782822463100", "3782", "822463", "100", index: 0, input: "3782822463100"]
["378282246310", "3782", "822463", "10", index: 0, input: "378282246310"]
["37828224631", "3782", "822463", "1", index: 0, input: "37828224631"]
["3782822463", "3782", "822463", undefined, index: 0, input: "3782822463"]
["378282246", "3782", "82246", undefined, index: 0, input: "378282246"]
["37828224", "3782", "8224", undefined, index: 0, input: "37828224"]
["3782822", "3782", "822", undefined, index: 0, input: "3782822"]
["378282", "3782", "82", undefined, index: 0, input: "378282"]
["37828", "3782", "8", undefined, index: 0, input: "37828"]
["3782", "3782", undefined, undefined, index: 0, input: "3782"]
["378", "378", undefined, undefined, index: 0, input: "378"]
["37", "37", undefined, undefined, index: 0, input: "37"]
["3", "3", undefined, undefined, index: 0, input: "3"]
This should do the trick:
/^(.{4})(.{6})(.{5})$/
If you specifically want to match digits, replace . with \d
Source: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions
EDIT: Since you also want partial matching, you can do this:
/^(.{1,4})(.{0,6})(.{0,5})$/