Help on C# Regular Expression

[Mani Ram]

Hi Guys,
I am new to C#. I have a xml string and I want to read a value of a
particular element. I do not want to use dom for this purpose. I think
Regular expression will solve this.

the code snippet goes like this...

string strMsg ="<MyTestXml><F irst>One</First><Second>T wo</Second><Third>T hree</Third></MyTestXml>"

Regex re1=new Regex(@"<First> .*?</First>",RegexOp tions.IgnoreCas e);
string strVal=re1.Matc h(strMsg).Value ;

strVal now contains "<First>One </First>"
How do I read just the value [ in this case, One ] from the
expression. Any help is greatly appreciated.

[Dmitriy Lapshin [C# / .NET MVP]]

Hello,

Change your pattern to:

@"<First>(.* ?)</First>"

and then inspect the Matches collection. The captured value should be
somewhere in the matches (most likely as a sub-match of a match at index 1).

--
Dmitriy Lapshin [C# / .NET MVP]
X-Unity Test Studio
http://x-unity.miik.com.ua/teststudio.aspx
Bring the power of unit testing to VS .NET IDE

"Mani Ram" <ma*****@hotmai l.com> wrote in message
news:70******** *************** *@posting.googl e.com...

Hi Guys,
I am new to C#. I have a xml string and I want to read a value of a
particular element. I do not want to use dom for this purpose. I think
Regular expression will solve this.

the code snippet goes like this...

string strMsg ="<MyTestXml><F irst>One</First><Second>T wo</Second><Third>T hree</Third></MyT
estXml>"
Regex re1=new Regex(@"<First> .*?</First>",RegexOp tions.IgnoreCas e);
string strVal=re1.Matc h(strMsg).Value ;

strVal now contains "<First>One </First>"
How do I read just the value [ in this case, One ] from the
expression. Any help is greatly appreciated.

[Brian Davis]

Use this expression:

(?<=<First>).*? (?=</First>)

The (?<=...) and (?=...) constructs are called zero-width positive
look-around assertions because they must be present for a match, but they do
not get included in the match. There are also negative versions (?<!...)
and (?!...).
Brian Davis
www.knowdotnet.com

"Mani Ram" <ma*****@hotmai l.com> wrote in message
news:70******** *************** *@posting.googl e.com...

Hi Guys,
I am new to C#. I have a xml string and I want to read a value of a
particular element. I do not want to use dom for this purpose. I think
Regular expression will solve this.

the code snippet goes like this...

string strMsg ="<MyTestXml><F irst>One</First><Second>T wo</Second><Third>T hree</Third></MyT
estXml>"
Regex re1=new Regex(@"<First> .*?</First>",RegexOp tions.IgnoreCas e);
string strVal=re1.Matc h(strMsg).Value ;

strVal now contains "<First>One </First>"
How do I read just the value [ in this case, One ] from the
expression. Any help is greatly appreciated.

[Mani Ram]

Thank you guys for your reply.

I have worked it this way:

string strMsg
="<mytestxml><f irst>one</first><second>t wo</second><third>t hree</third><
/mytestxml>"

string reMsg = "<first" + "[^>]*" + ">" + "(?<contents>.* ?)" +
"</first>";

Match m1 = Regex.Match(str Msg, reMsg,RegexOpti ons.Multiline |
RegexOptions.Ig noreCase | RegexOptions.Ig norePatternWhit espace);

string s=m1.Groups["contents"].ToString();

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