Please help on regular expression

[lordbearsg]

How do i apply regular expression to find for host name from the text below and it prints out Host name: IT786P20?? Host Name: IT786P20 OS Name: Microsoft Windows XP Professional

[Lost User]

Hi The question is if you really want to use a regular expression for this. wouldn't a string operation do the job? someting like

string blah = @"Host Name: IT786P20
OS Name: Microsoft Windows XP Professional"
int colonIndex = blah.IndexOf(":");
string HostName = blah.SubString(colonIndex+1,blah.IndexOf("\r",colonIndex+1)-colonIndex+1).Trim();
Console.WriteLine(HostName);

btw. if you want to work with regular expressions i would recommend you to get expresso it's a free tool with a great regex-Builder and Tester. here[^] greets m@u

[lordbearsg]

yes i have tried using the regex-builder but i do not know what is the syntax for making a regular expression. my ultimate purpose of using regular expression is becuase i wan to use regular expression to find the text that i want from a text file. btw is there any software that allows me to type in a word to match from a sample text and gives me the regular expression syntax?

[Lost User]

ah ok.. but you could still use String Operations for it ;) will that "Machine Name: someName" occur only once in the file? if so, there's almost no difference between doing it the String Operation - Way or with Regex.. what you mean with syntax? basically if you want to match a word this already IS a regular Expression it's no problem to say Regex r = new Regex("Machine Name:"); or in your case, to get the Machine Name "Machine Name: (?\w)". if you use it like that, after applying the regex on your string with Match() you can say string MachineName = myMatch.Groups["MachineName"].Value;

[Sandilian]

/// using System.Text.RegularExpressions;(NameSpace for Regular Exprestion...) public static bool IsAlphaNumeric(String strToCheck) { Regex objAlphaNumericPattern = new Regex(@"^[a-zA-Z0-9]*$"); return !objAlphaNumericPattern.IsMatch(strToCheck); } public static bool IsAlphaNumericWithSpace(String strToCheck) { Regex objAlphaNumericSpacePattern = new Regex(@"^[a-zA-Z0-9\s]*$"); return !objAlphaNumericSpacePattern.IsMatch(strToCheck); } public static bool IsNumericWithDot(String strToCheck) { Regex objAlphaNumericPattern = new Regex(@"^[0-9.]*$"); return !objAlphaNumericPattern.IsMatch(strToCheck); } public static bool IsNumeric(String strToCheck) { Regex objNumericPattern = new Regex(@"^[0-9]*$"); return !objNumericPattern.IsMatch(strToCheck); } public static bool IsAlphaNumericWithDot(String strToCheck) { Regex objAlphaNumericPattern = new Regex("[^a-zA-Z0-9.]"); return !objAlphaNumericPattern.IsMatch(strToCheck); } public static bool IsAlphaNumericWithDotPeriodSpace(String strToCheck) { Regex objAlphaNumericPattern = new Regex(@"^[a-zA-Z0-9\s.,]*$"); return !objAlphaNumericPattern.IsMatch(strToCheck); } public static bool IsAlphaNumericWithDotPeriodSpaceHyphen(String strToCheck) { Regex objAlphaNumericPattern = new Regex(@"^[a-zA-Z0-9\s.,-]*$"); return !objAlphaNumericPattern.IsMatch(strToCheck); } public static bool IsAlphaNumericWithDotPeriodSpaceHyphenSlash(String strToCheck) { Regex objAlphaNumericPattern = new Regex(@"^[a-zA-Z0-9\s.,-/]*$"); return !objAlphaNumericPattern.IsMatch(strToCheck); } public static bool IsAlphaNumericWithSlash(String strToCheck) { Regex objAlphaNumericPattern = new Regex(@"^[a-zA-Z0-9/]*$"); return !objAlphaNumericPattern.IsMatch(strToCheck); } public static bool IsAmount(String strToCheck) { Regex objAlphaNumericPattern = new Regex(@"^(\d{1,12}|(\d{1,12}\.{1}\d{1,3}){1})$"); return !objAlphaNumericPattern.IsMatch(strToCheck); } public static bool IsAmountBECost(String strToCheck) { Regex objAmountPattern = new Regex(@"^(\d{1,8}|(\d{1,8}\.{1}\d{1,3}){1})$"); return !objAmountPattern.IsMatch(strToCheck); }

modified on Tuesday, December 18, 2007 4:08:49 AM

[lordbearsg]

i mean syntax like this: (?sx-m)[^\r\n].*?(?:(?:\.|\?|!)\s) It gave me an error like this Error 1 No overload for method 'Regex' takes '1' arguments Sry to bother u but can u give me a complete code if i were to give u a psuedo code??

[Lost User]

lordbearsg wrote:

It gave me an error like this Error 1 No overload for method 'Regex' takes '1' arguments

hmm.. that's strange.. in .net 1.1 and 2.x it works if you only pass the pattern to the constructor. what other Parameter does it want?

[leppie]

None of these would work, as you are returning not IsMatch, so it will return true if its not matched. :doh: The . in some places need to be escaped too, as it will match anything, if unescaped.

xacc.ide
IronScheme a R5RS/R6RS-compliant Scheme on the DLR
The rule of three: "The first time you notice something that might repeat, don't generalize it. The second time the situation occurs, develop in a similar fashion -- possibly even copy/paste -- but don't generalize yet. On the third time, look to generalize the approach."

[lordbearsg]

Below is how i intented on how to make the code work but how do i code it? Pseudo code class test { public void Test(some arugments??) { Read systeminfo.txt; Search for the word Host Name and show in a message box; } }