How to represent a fix number of repeats in regular expression

Question

I am wondering if there is a better to represent a fix amount of repeats in a regular expression  For example  if I just want to match exactly 14 letters digits  I am using   w w w w w w w w w w w w w w  which will match a word like UNL075BE499135 and not match UNL075BE499135AAA is there a handy way to do it  In am currently doing it in java but I guess this may apply to other language as well  Thanks in advance

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w 14   in Perl and any Perl-style regex   If you want to learn more about regular expressions - or just need a handy reference -  the Wikipedia Entry on Regular Expressions is actually pretty good

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For Java   Quantifiers documentation  X  exactly n times  X n  X  at least n times  X n   X  at least n but not more than m times  X n m

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In Java create the pattern with Pattern p   Pattern compile     w 14      for further information see the javadoc

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The finite repetition syntax uses  m n  in place of star plus question mark   From java util regex Pattern   X n       X  exactly n times X n       X  at least n times X n m     X  at least n but not more than m times   All repetition metacharacter have the same precedence  so just like you may need grouping for       and    you may also for  n m     ha  matches e g   haaaaaaaa  ha 3  matches only  haaa   ha   matches e g   hahahahaha   ha  3  matches only  hahaha    Also  just like       and    you can add the   and   reluctant and possessive repetition modifiers respectively       System out println           xxxxx  replaceAll  x 2 3      x             x  x        System out println           xxxxx  replaceAll  x 2 3       x             x  x x    Essentially anywhere a   is a repetition metacharacter for  zero-or-more   you can use       repetition construct  Note that it s not true the other way around  you can use finite repetition in a lookbehind  but you can t use   because Java doesn t officially support infinite-length lookbehind   References   regular-expressions info Repetition   Related questions   Difference between    and     for regex regex n       regex n   Using explicitly numbered repetition instead of question mark  star and plus   Addresses the habit of some people of writing a 1 b 0 1  instead of ab

[java] How to represent a fix number of repeats in regular expression?

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