Java string split with dot

Question

Why does the second line of this code throw ArrayIndexOutOfBoundsException   String filename    D  some folder 001 docx   String extensionRemoved   filename split      0     While this works   String driveLetter   filename split      0     I use Java 7

User · Answer

I believe you should escape the dot  Try   String filename    D  some folder 001 docx   String extensionRemoved   filename split        0     Otherwise dot is interpreted as any character in regular expressions

User · Answer

This is because   is a reserved character in regular expression  representing any character  Instead  we should use the following statement   String extensionRemoved   filename split        0

User · Answer

You need to escape the dot if you want to split on a literal dot   String extensionRemoved   filename split        0     Otherwise you are splitting on the regex    which means  any character   Note the double backslash needed to create a single backslash in the regex     You re getting an ArrayIndexOutOfBoundsException because your input string is just a dot  ie      which is an edge case that produces an empty array when split on dot  split regex  removes all trailing blanks from the result  but since splitting a dot on a dot leaves only two blanks  after trailing blanks are removed you re left with an empty array   To avoid getting an ArrayIndexOutOfBoundsException for this edge case  use the overloaded version of split regex  limit   which has a second parameter that is the size limit for the resulting array  When limit is negative  the behaviour of removing trailing blanks from the resulting array is disabled       split        -1     returns an array of two blanks  ie            ie  when filename is just a dot      calling filename split        -1  0  will return a blank  but calling filename split        0  will throw an ArrayIndexOutOfBoundsException

User · Answer

The dot  quot   quot  is a special character in java regex engine  so you have to use  quot     quot  to escape this character  final String extensionRemoved   filename split  quot     quot   0    I hope this helps

[java] Java string split with "." (dot)

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