Simple number validation using regular expression

Question

I am new to regular expression. I need to validate the following using regular expression:

an input string is digit only between 6 and 10 characters long

Questions asking for code must demonstrate a minimal effort in solving the actual problem, including the attempted code and the encountered issues — HamZa
– HamZa, Commented Jan 21, 2014 at 22:29
Combining your regex with a java number class such as BigDecimal will assist you to remove leading and trailing unnecessary zero's of the number. — Asanka Siriwardena
– Asanka Siriwardena, Commented Mar 30, 2016 at 11:52

uchuugaka · Accepted Answer · 2014-01-12 17:03:08Z

7

You can use the following RegEx, \\d{6,10}. This would match any string which has only digits and the number of times digits can occur is 6 to 10.

(By digit we mean any character with the Unicode General Category of Nd (Number, Decimal Digit.) as Java uses the ICU Regular Expressions libraries.)

You can see how the RegEx works here

    String pattern = "\\d{6,10}", myString = "111111";
    System.out.println(myString.matches(pattern));

would print

true

edited Jan 12, 2014 at 17:03

uchuugaka

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answered Jan 12, 2014 at 1:41

thefourtheye

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9 Comments

user2498634 Over a year ago

Thank you not only for the answer, but also for the regex tester site. This is exactly what I needed!

Justin Over a year ago

You really don't need the anchors, since you are using String#matches(); it acts as if the anchors are already there (if you don't believe me, try it out).

Behe Over a year ago

It's not correct that this regex matches "any string which starts and ends with a number". This matches

thefourtheye Over a year ago

@Behe As long as the length is within the range 6-10 and it has only numbers, it matches OP's requirement :)

Behe Over a year ago

@thefourtheye: My comment is about the formulation, not the regex itself: "Only numbers" is different than "any string which starts and ends with a number".

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CodeIsLife · Accepted Answer · 2014-01-12 01:44:28Z

2

you can use this code

[0-9]{6, 10}

or

\d{6, 10}

enjoy !

answered Jan 12, 2014 at 1:44

CodeIsLife

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