Replacing Text without changing case??

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wildman@noclient.net - 06 Mar 2008 21:46 GMT

RE: Replacing Text without changing case??

This code works great, but case has to be exact.

Research.Text = Research.Text.Replace(textboxSearch.Text, "" +
textboxSearch.Text + "")

I found some c# code, but I can't make it work in vb.net:

Regex.Replace(Research.Text, textboxSearch.Text, New
MatchEvaluator(HiLite), RegexOptions.IgnoreCase)

...
Public Shared Function HiLite(ByVal match As Match) As String
Return "" + match.Value + "*"
End Function

Its complaining about Hilite in the first line.

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Jesse Houwing - 06 Mar 2008 22:00 GMT

Hello wildman@noclient.net,

> RE: Replacing Text without changing case??
>
[quoted text clipped - 13 lines]
> End Function
> Its complaining about Hilite in the first line.

This isn't that hard to do. You don't even need a Match evaluator.

Use

Regex.Replace(string.format("({0})", input), "$1", RegexOptions.IgnoreCase)

This will copy the value you found in the first group (which is created by
adding (...) around the text to match), with valueofthatgroup. This
accomplishes your goal.

There is one thing you have to take care of though. As you're using the users
input you are now allowing the user to insert additional regex into the input.
The Regex class has a static method called Escape to take care of that, to
you'll get:

Regex.Replace(string.format("({0})", Regex.Escape(input)), "$1", RegexOptions.IgnoreCase)

--
Jesse Houwing
jesse.houwing at sogeti.n

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wildman@noclient.net - 07 Mar 2008 10:19 GMT

THANK YOU!

> Regex.Replace(string.format("({0})", Regex.Escape(input)), "$1", RegexOptions.IgnoreCase)

Presuming

user search input : textboxSearch.text
replace is : ""+textboxSearch.text+""
data I'm looking to impact is : Research.Text (a gridview row label
control)

How would I use the above?

I tried:

Imports System.Text.RegularExpressions

Research.Text = Regex.Replace(String.Format("({0})",
Regex.Escape(textboxSearch.Text)), "$1",
RegexOptions.IgnoreCase)

Getting an error on Regex.Replace : Reference to a non-shared member
requires an object reference.

So I noticed it appears to be formated incorrectly and probably should
be :

Research.Text = Regex.Replace(String.Format("({0})"),
Regex.Escape(textboxSearch.Text), "$1",
RegexOptions.IgnoreCase)

However that did not work.

I also tried:

No effect:
Research.Text = Regex.Replace(String.Format("({0})"),
Regex.Escape(textboxSearch.Text), "$1",
RegexOptions.IgnoreCase)

replaces string with actually "$1":
'Research.Text = Regex.Replace(Research.Text,
Regex.Escape(textboxSearch.Text), "$1",
RegexOptions.IgnoreCase)

works, in finding the strings, but replaces with wrong case:
'Research.Text = Regex.Replace(Research.Text,
Regex.Escape(textboxSearch.Text), ""+ textboxSearch.Text+"",
RegexOptions.IgnoreCase)

Thanks again.

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Jesse Houwing - 07 Mar 2008 14:36 GMT

Hello wildman@noclient.net,

> THANK YOU!
>
>> Regex.Replace(string.format("({0})", Regex.Escape(input)),
>> "$1", RegexOptions.IgnoreCase)

> Presuming
>
[quoted text clipped - 38 lines]
> Regex.Escape(textboxSearch.Text), ""+ textboxSearch.Text+"",
> RegexOptions.IgnoreCase)

Sorry, I mixed the input and the pattern parameters to the Regex.Replace
function.

This should do it (in C#, I'm no star in VB):

string input = "a.b.c.d.e.f.g.h.i.j";
string output = Regex.Replace(input, string.Format("({0})", Regex.Escape(input)),
"$1");
Console.WriteLine(output);

--
Jesse Houwing
jesse.houwing at sogeti.nl

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wildman@noclient.net - 12 Mar 2008 21:05 GMT

I'm close, but this ends up highighting all of research.text when a
match is found. How can I highlight just the found string in it's
original case?

Research.Text = Regex.Replace(Research.Text, String.Format("({0})",
Regex.Escape(Research.Text)), "
$1")

thanks.

Reply to this Message

Jesse Houwing - 14 Mar 2008 19:38 GMT

Hello wildman@noclient.net,

> I'm close, but this ends up highighting all of research.text when a
> match is found. How can I highlight just the found string in it's
[quoted text clipped - 3 lines]
> Regex.Escape(Research.Text)), "
> $1")

That shouldn't be too hard, but currently you're puttign the whole string
in for both input and pattern.

> Research.Text = Regex.Replace(

Research.Text, <== input
String.Format("({0})", Regex.Escape(Research.Text)), <== text to search
"$1" <== replacement
)

So make sure you only put the text to search in the correct place.

--
Jesse Houwing
jesse.houwing at sogeti.nl

Reply to this Message

Jesse Houwing - 06 Mar 2008 22:04 GMT

Hello wildman@noclient.net,

> RE: Replacing Text without changing case??
>
[quoted text clipped - 13 lines]
> End Function
> Its complaining about Hilite in the first line.

Ohh and to fix the problem you're having with the current implementation
(which is slower and still needs the Regex.Escape) you probably have to do
either:

> Regex.Replace(Research.Text, textboxSearch.Text, New
> MatchEvaluator(HiLite), RegexOptions.IgnoreCase)
[quoted text clipped - 3 lines]
> Return "" + match.Value + "*"
> End Function

> Regex.Replace(Research.Text, textboxSearch.Text, New
> MatchEvaluator(MyClassName.HiLite), RegexOptions.IgnoreCase)
[quoted text clipped - 3 lines]
> Return "" + match.Value + "*"
> End Function

--
Jesse Houwing
jesse.houwing at sogeti.nl

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Replacing Text without changing case??

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