regular expression for DOT

Question

What is the regular expression for   and       if key matches          do something       The matches accepts String which asks for regular expression  Now i need to remove all DOT s inside my MAP

User · Answer

You should use contains not matches  if nom contains           System out println  OK    else     System out println  Bad

User · Answer

matches any character so needs escaping i e      or     within a Java string  because   itself has special meaning within Java strings    You can then use      or    2  to match exactly 2 dots

User · Answer

Use String Replace   if you just want to replace the dots from string  Alternative would be to use Pattern-Matcher with StringBuilder  this gives you more flexibility as you can find groups that are between dots  If using the latter  i would recommend that you ignore empty entries with          public static int count String str  String regex        int i   0      Pattern p   Pattern compile regex       Matcher m   p matcher str       while  m find              m group            i              return i     public static void main String   args        int i   0  j   0  k   0      String str    - -  -   - - --  -k    k   k  k k- -           this will just remove dots     System out println str replaceAll                     this will just remove sequences of      dots     System out println str replaceAll      2                 this will just remove sequences of dots  and gets        multiple of dots as 1     System out println str replaceAll                       for this to be more obvious  consider following        System out println count str               System out println count str       2          System out println count str                The output will be   --------kkkkk-- - -- - - ---kk kk k- - --------kkkkk-- 21 7 11

User · Answer

Most special characters have no meaning inside the square brackets  This expression matches any of         or the dot

User · Answer

1    or      2

[java] regular expression for DOT

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