CODEWITHSUNDEEP
javaregex
kenzouji
kenzouji

Reputation: 41

Java Regex validation for list of numbers

I'm a newbie in java regex. i am seeking for advise for this series of number checking :

Number, must be >= 10 digits, user is not allowed to input as follows:

"0000000000","1111111111","2222222222","3333333333","4444444444",
"5555555555","6666666666","7777777777","8888888888","9999999999",
"1234567890","00000000000","11111111111","22222222222","33333333333",
"44444444444","55555555555","66666666666","77777777777","88888888888",
"99999999999"

currently my regex pattern is something like this 

^(?=\\d{8,11}$)(?:(.)\\1*)$

this validates all numbers in the series except the 1234567890. any advise is appreciated. Thank you.

Upvotes: 3

Views: 1618

Answers (2)

Braj
Braj

Reputation: 46891

Number, must be >= 10 digits, user is not allowed to input as follows.

You can use String.matches() method to check for any match.

Try below regex that checks for possible inputs as suggested by you. add more as per your need.

1234567890|(\d)\1{9}

Here is Live demo

Pattern explanation:

  1234567890               '1234567890'
 |                        OR
  (                        group and capture to \1:
    \d                       digits (0-9)
  )                        end of \1
  \1{9}                    what was matched by capture \1 (9 times)

Sample code:

String regex ="1234567890|(\\d)\\1{9}";

System.out.println("0000000000".matches(regex)); // true
System.out.println("1234567890".matches(regex)); // true
System.out.println("1111111111".matches(regex)); // true

Upvotes: 0

zx81
zx81

Reputation: 41848

Use this:

^(?!(\d)\1+\b|1234567890)\d{10,}$

See what matches and fails in the Regex Demo.

To validate in Java, with matches we don't need the anchors:

if (subjectString.matches("(?!(\\d)\\1+\\b|1234567890)\\d{10,}")) {
    // It matched!
  } 
else {  // nah, it didn't match...  
     }

Explanation

  • The negative lookahead (?!(\d)\1+\b|1234567890) asserts that what follows is not...
  • (\d)\1+\b one digit (captured to Group 1), follows by repetitions of what was matched by Group 1, then a word boundary
  • OR |
  • 1234567890
  • \d{10,} matches ten or more digits

Upvotes: 1

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