Solved

Java substring replacement

Posted on 2008-10-01
6
897 Views
Last Modified: 2013-11-23
I am looking for a good method for doing substring replacement.
For example, the string is "Experts collaborate with you to find solutions! Make their job easier by clearly describing your issue with specific information." and I want to replace the substring "you" to let say "Jack Bauer". I was wondering which method is the best! Please show code example! Thanks!
0
Comment
Question by:alfredng1
6 Comments
 
LVL 6

Expert Comment

by:RishadanPort
ID: 22619880
const string varToRemove = "you";
const string varToRemove2 = "You";
const string varToReplace = "Jack Bauer";

string.replace(varToRemove, varToReplace);

string.replace(varToRemove2, varToReplace);
0
 
LVL 12

Expert Comment

by:basav_com
ID: 22619881
You need to use  'replace' method of String.
Here is the example:
  String str="How are you";
  str = str.replace("you","John");
  System.out.println(str);
0
 
LVL 12

Expert Comment

by:basav_com
ID: 22619885
Same solution at the same time ;)
ID:22619880Author:RishadanPortDate:10.02.2008 at 04:23AM IST
ID:22619881Author:basav_comDate:10.02.2008 at 04:23AM IST

0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 1

Assisted Solution

by:verickson
verickson earned 100 total points
ID: 22619919


Use the Pattern and Matcher classes (import java.util.regex.*;)

http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html 



String str = "You are sad.";

System.out.println("Before:" + str);
 

Pattern pattern = Pattern.compile("sad"); // Pattern is "sad"

Matcher match = pattern.matcher(str);     // Apply the pattern to str
 

String newStr = match.replaceAll("happy");  // Replace "sad" with "happy" and store in newStr

System.out.println("After: " + newStr);

Open in new window

0
 
LVL 9

Accepted Solution

by:
mbodewes earned 150 total points
ID: 22619966
It depends a bit on what kind of functionality you are looking for. You probably would not want to replace "you" in "your" with Jack Bauer, whoever that is.

So then you would have to do something like:



	final String yourEx = "^(.*\\W)you(\\W.*)$";

		final Pattern yourPattern = Pattern.compile(yourEx);

		final Matcher yourMatcher = yourPattern.matcher("Experts collaborate with you to find solutions! Make their job easier by clearly describing your issue with specific information.");

		if(!yourMatcher.matches()) {

			throw new RuntimeException("No matches found, this is bad");

		}

		final String bauerStr = yourMatcher.group(1) + "Jack Bauer" + yourMatcher.group(2);

		System.out.printf("The new string is: \"%s\"%n", bauerStr);

	

Open in new window

0
 
LVL 9

Expert Comment

by:mbodewes
ID: 22619968
Checked with Eclipse and QuickREx by the way, use the right tool for the right job.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java Flight Recorder and Java Mission Control together create a complete tool chain to continuously collect low level and detailed runtime information enabling after-the-fact incident analysis. Java Flight Recorder is a profiling and event collectio…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

24 Experts available now in Live!

Get 1:1 Help Now