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Thread: Replacing parts of a String using line.replaceAll

  1. #1
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    Default Replacing parts of a String using line.replaceAll

    Hi, I am trying to create a program that reads a .txt file and finds any abbreviations and if found puts <> around it. However, I am having a problem that if a word has a "u" like "you" it will print "yo<u>". I only want it to do that when only "u" is present and such.
    I am new to this and any help will be greatly appreciated! Thanks!
    Here is my code:


    import java.util.*;
    import java.io.*;
    public class TextFileInputDemo
    {
    public static void main(String[] args)
    {
    //file must already exist to be read by program.
    String fileName = "file.txt";
    Scanner inputStream = null;
    System.out.println("The text message reads:");

    try
    {
    inputStream = new Scanner (new File(fileName)); //Import files
    }

    //file not found
    catch(FileNotFoundException e)
    {
    System.out.println("Error opening the file : " + fileName);
    System.exit(0);
    }

    //read files and finds abbreviations.
    while(inputStream.hasNextLine())
    {
    String line = inputStream.nextLine();
    line = line.toLowerCase();
    if (line.contains("")) //reads every line
    {
    line = line.replaceAll("lol", "<lol>");
    line = line.replaceAll("iirc", "<iirc>");
    line = line.replaceAll("4", "<4>");
    line = line.replaceAll("ttfn", "<ttfn>");
    line = line.replaceAll("wbu", "<wbu");
    line = line.replaceAll("dis", "<dis>");
    line = line.replaceAll("ily", "<ily>");
    line = line.replaceAll("aka", "<aka>");
    line = line.replaceAll("wrud", "<wrud>");
    line = line.replaceAll("wit", "<wit>");
    line = line.replaceAll("u", "<u>");
    line = line.replaceAll("nm", "<nm>");
    line = line.replaceAll("r", "<r>");


    System.out.println(line);
    }
    else //Line has no abbreviations.
    {
    System.out.println(line);
    }

    }

    inputStream.close();
    }

    }


  2. #2
    Super Moderator Sean4u's Avatar
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    Default Re: Replacing parts of a String using line.replaceAll

    Look at java.util.regex.Pattern and change the first argument to replaceAll so that it's like "[not a valid word character]u[not a valid word character]" to solve your problem

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