In java how to get substring from a string till a character c

Question

I have a string  which is basically a file name following a naming convention  abc def ghi  I would like to extract the substring before the first    ie a dot   In java doc api  I can t seem to find a method in String which does that  Am I missing something  How to do it

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In java lang String you get some methods like indexOf    which returns you first index of a char string  and lstIndexOf  which returns you the last index of String char  From Java Doc      public int indexOf int ch    public int indexOf String str    Returns the index within this string of the first occurrence of the specified character

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Here is code which returns a substring from a String until any of a given list of characters           Return a substring of the given original string until the first appearance    of any of the given characters      lt p gt     e g  Original  ab amp cd-ef amp gh     1  Separators    amp     -      Result   ab     2  Separators        -      Result   ab amp cd     3  Separators               Result   ab amp cd-ef amp gh         param original   the original string     param characters the separators until the substring to be considered     return the substring or the original string of no separator exists     public static String substringFirstOf String original  List lt Character gt  characters        return characters stream                map original  indexOf               filter min - gt  min  gt  0               reduce Integer  min               map position - gt  original substring 0  position                orElse original

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You can just split the string    public String   split String regex    Note that java lang String split uses delimiter s regular expression value  Basically like this     String filename    abc def ghi          full file name String   parts   filename split            String array  each element is text between dots  String beforeFirstDot   parts 0         Text before the first dot   Of course  this is split into multiple lines for clairity  It could be written as  String beforeFirstDot   filename split        0

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How about using regex   String firstWord   filename replaceAll               This replaces everything from the first dot to the end with     ie it clears it  leaving you with what you want   Here s a test   System out println  abc def hij  replaceAll                 Output   abc

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If your project already uses commons-lang  StringUtils provide a nice method for this purpose   String filename    abc def ghi    String start   StringUtils substringBefore filename           returns  abc    see javadoc  2 6   3 1

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look at String indexOf and String substring     Make sure you check for -1 for indexOf

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This could help   public static String getCorporateID String fileName         String corporateId   null       try           corporateId   fileName substring 0  fileName indexOf                   System out println new Date             Corporate               corporateId           return corporateId        catch  Exception e            corporateId   null          e printStackTrace               return corporateId

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or you may try something like   abc def ghi  substring 0  abc def ghi  indexOf c -1

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The accepted answer is correct but it doesn t tell you how to use it  This is how you use indexOf and substring functions together   String filename    abc def ghi          full file name int iend   filename indexOf         this finds the first occurrence of        in string thus giving you the index of where it is in the string     Now iend can be -1  if lets say the string had no     at all in it i e  no     is found     So check and account for it   String subString  if  iend    -1         subString  filename substring 0   iend     this will give abc

[java] In java how to get substring from a string till a character c?

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