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Replace word in string but keep the case the same and complete words only in asp.net vb

Posted on 2010-08-13
Medium Priority
Last Modified: 2013-11-26
Hello everyone.

I am currently working on a website that will create websites for my firm andi am stuck.

On the website, whenever a few certain words are mention, it is hyperlinked.  This is done by me hardcoding.

I know the basic replace(string,"myWord","<a href etc>") , however, this does a few things that i need to work round.

Firstly, If the string has a word i want to replace is Adult and the word in the string is  adult, it changes it to a capital A.

Also, taking the same word to replace, if the word in the string is Adultery it will replace the Adult, but i would not want it replaced.

So is there a way of keeping the case when replacing a string and also is there any way of making it match the whole word only..

I hope this makes sense.

Question by:Bakersville
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Accepted Solution

Yiogi earned 1000 total points
ID: 33427902
There are two ways to do what you want.

a) You can use a regular expression search and replace the words with the links but keep the original string instead of the word you want to type. Let me know if you need for info on this.
b) You could also simply search for the word " Adult " for example including the spaces so that you are sure it's what you want and not a container in another word. Save the index and lets say your message variable is msg then you'd do this:
msg = msg.Substring(0, indexOfWord) + replacementStringPrefix + msg.Substring(indexOfWord, wordLength) + replacementStringSuffix + msg.Substring(indexOfWord + wordLength)
where your replacement prefix would be the "<a href='adsfsdf'>" and suffix would be "</a>"

Hope it sounds clear to you.
LVL 22

Assisted Solution

by:Om Prakash
Om Prakash earned 1000 total points
ID: 33427906
You can keep the case by using reqular expression.

Dim s As String = "this IS TEST"
Dim findStr As String = "test"
Dim replStr As String = "MoreTest"
Dim rx As New Regex(findStr, RegexOptions.IgnoreCase)
Response.Write(rx.Replace(s, replStr))

Author Comment

ID: 33427985
Thank you both for your help.

om: i tried your example, but it does replace the middle of a word, so added Yiogi spaces in and that got round the issue.

However, how would i put the original word into the hyperlink, ie

<a href="www.google.co.uk">original word</a>

Yiogi: i tried your

msg = msg.Substring(0, indexOfWord) + replacementStringPrefix + msg.Substring(indexOfWord, wordLength) + replacementStringSuffix + msg.Substring(indexOfWord + wordLength)
where your replacement prefix would be the "<a href='adsfsdf'>" and suffix would be "</a>"

But i have to say, i do not understand it at all, could you please help???

Thank you again for your quick reply.

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Author Comment

ID: 33428115
Kept looking round and found this

       Dim myString As String = "BlaH bLaH BLAH 1blah1"
        Dim rx As New Regex(" (blah) ", RegexOptions.IgnoreCase)
        myString = rx.Replace(myString, " <b>$1</b> ")

It got over the issue of keeping the text the same font, but still can't find anywhere apart from putting spaces in unless anyone knows of a way...


Author Comment

ID: 33428255
Hello again both,

Thank you for putting me on the right path, found the solution by an Classic ASP expression i found. so change om code to read

        Dim WordToReplace As String = "blah"
        Dim myString As String = "BlaH bLaH BLAH blblahah"
        Dim rx As New Regex("\b(" & WordToReplace & ")\b", RegexOptions.IgnoreCase)
        myString = rx.Replace(myString, "<b>$1</b>")

Now i ca make these change DB driven so if they change their mind i don't have to change my code...


Author Closing Comment

ID: 33428267
Thank you again

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