Solved

Regular Expression question

Posted on 2008-10-16
7
324 Views
Last Modified: 2012-05-05
I need to obtain a Regular expression pattern which will do the following-
Given an input string, return true if it contains the words APPLE and/or ORANGE but not the word MANGO. The words may appear in any order in the string.

Example:
Input : " I like APPLE and MANGO"        Output : False
Input : "I like APPLE and ORANGE"        Output : True
Input : "I like ORANGE"                          Output : True
Input : "I like MANGO"                           Output : False
0
Comment
Question by:CuteBug
7 Comments
 
LVL 20

Expert Comment

by:informaniac
ID: 22738299
Try this
(APPLE|ORANGE)
0
 
LVL 16

Author Comment

by:CuteBug
ID: 22738362
In this case, the first example will fail (as APPLE is present and so is MANGO, in which case it should have returned false)
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 22738430
(?!MANGO)(APPLE|ORANGE)
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 27

Expert Comment

by:ddrudik
ID: 22738980

Regex re = new Regex(@"(?=.*(APPLE|ORANGE))(?!.*MANGO).*",RegexOptions.Singleline);

Open in new window

0
 
LVL 27

Accepted Solution

by:
ddrudik earned 500 total points
ID: 22738991
And with the addition of the ^ and $ for string boundaries.
Regex re = new Regex(@"^(?=.*(APPLE|ORANGE))(?!.*MANGO).*$",RegexOptions.Singleline);

Open in new window

0
 
LVL 16

Author Closing Comment

by:CuteBug
ID: 31507051
Thanks a lot!
0
 
LVL 27

Expert Comment

by:ddrudik
ID: 22739066
Thanks for the question and the points.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
c# - Best approach for objects in functions 3 27
Problem to Office 1 39
C# XML Get Values 4 33
Selenium and Xpath 4 27
This article describes a simple method to resize a control at runtime.  It includes ready-to-use source code and a complete sample demonstration application.  We'll also talk about C# Extension Methods. Introduction In one of my applications…
Summary: Persistence is the capability of an application to store the state of objects and recover it when necessary. This article compares the two common types of serialization in aspects of data access, readability, and runtime cost. A ready-to…
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…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…

679 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