String manupulations using Regular Expression

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4.00/5 (1 vote)

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sry for yesterday's question..

There is a string named as "something.docx". How to split that string using Regular Expression.

Also find how modify the ".docx" extension,means how it can be replace with ".pdf".
How to find the reverse of string, means In "something.docx", you may come from back onwards, and find the first .(dot) and split the string upto that .(dot) and capture the front string means "something" and add ".pdf" extensions.

Note: You consider "something.docx" as a string, not a document and also its not converted into pdf format. just replace .docx with .pdf

Posted 26-Apr-11 21:18pm

VINODKUMAR T

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ambarishtv 27-Apr-11 3:45am

string result = Regex.Replace("Sample.docx", "docx", "pdf");

2 solutions

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Abhinav S · Accepted Answer · 2011-04-26T21:21:00

Solution 1

This article[^] would give you a brief idea of how powerful regular expressions can be and how they could be used to split strings.

Posted 26-Apr-11 21:21pm

Abhinav S

Comments

Sergey Alexandrovich Kryukov 27-Apr-11 12:24pm

Well, a 5 for the reference but... No!
Nothing really to do with Regex -- I feel like this is a Regex season in some school(s), no less :-)
Please see my answer for really practical approach.
--SA

Abhinav S 27-Apr-11 12:26pm

Thanks for the 5. I shall accept your comment :).

Tarun.K.S 27-Apr-11 14:27pm

Good link and bookmarked. 5+

Abhinav S 27-Apr-11 23:16pm

Thanks Tarun.

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-04-27T06:14:00

Solution 2

You don't need Regular expressions here.

Look at the class System.IO.Path. How about System.IO.Path.ChangeExtension and System.IO.Path.GetExtension, System.IO.Path.GetFileName and System.IO.Path.GetFileNameWithoutExtension? It will cover all you need. See:
http://msdn.microsoft.com/en-us/library/system.io.path.aspx[^].

After all, you have string.Split.

A final note: nothing "manipulates" strings — they are immutable. All methods only read string data and created other data from scratch. Practically, this is good to know, for performance and other reasons.

—SA

Posted 27-Apr-11 6:14am

Sergey Alexandrovich Kryukov

Comments

Abhinav S 27-Apr-11 12:26pm

5 for the alternate approach.

Sergey Alexandrovich Kryukov 27-Apr-11 15:22pm

Thank you, Abhinav.
--SA

Olivier Levrey 27-Apr-11 12:29pm

I agree. Simple tools should be enough for simple tasks. My 5 SA.

Sergey Alexandrovich Kryukov 27-Apr-11 15:22pm

Exactly!
Thank you, Olivier.
--SA

Tarun.K.S 27-Apr-11 14:27pm

Good answer. 5+

Sergey Alexandrovich Kryukov 27-Apr-11 15:22pm

Thank you, Tarun.
--SA