Develop Reference

How to use Linq to Split a String on newlines and space?

I have a string:
string data =
"item1 actived
item2 none
item special I none
item special II actived"
you can see 4 rows in the data.
I need to split a string into a List item as below:
item[0]={Name=item1, Status=actived}
item[1]={Name=item2, Status=none}
item[2]={Name=item Special I, Status=none}
item[3]={Name=item Special II, Status=actived}
I'm tried:
var s = SplitReturn(data);
public string[] SplitReturn(string name)
{
return name.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
}
How do I can Split space in my string and then convert to List?

string data =
#"item1 actived
item2 none
item special I none
item special II actived";
var result = data.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)
.Select(item => {
int lastSpace = item.LastIndexOf(' ');
return new
{
Name = item.Substring(0, lastSpace).Trim(),
Status = item.Substring(lastSpace, item.Length - lastSpace).Trim()
}; }).ToList();

string and arrays manipulation c#

Here is the code and it is working fine for a single input string
string[] stop_word = new string[]
{
"please",
"try",
"something",
"asking",
"-",
"(", ")",
"/",
".",
"was",
"the"
};
string str = "Please try something (by) yourself. -befor/e asking";
foreach (string word in stop_word)
{
str = str.ToLower().Replace(word, "").Trim();
}
and the output is by yourself before
and now I want to have
string str[] = new string[]
{
"Please try something-by yourself. before (CAD) asking/",
"cover, was adopted. The accuracy (of) the- change map was"
};
and also may be the number of strings is greater than 2 then how to alter this above code to display the str array or store in a text file or database.
Please help with acknowledgements. Thanks

The code for single string need to be put inside a loop for string array
List<string> result = new List<string>();
for(int i =0; i<str.Length; i++)
{
foreach (string word in stop_word)
{
str[i] = str[i].ToLower().Replace(word, "").Trim();
str[i] = Regex.Replace(str[i], #"\s+", " ");
}
result.Add(str[i]);
}
foreach(string r in result)
{
//this is to printout the result
Console.WriteLine(r);
}
You can try it here: https://dotnetfiddle.net/wg83gM
EDIT:
Use regex to replace multiple spaces with one single space

Here is an easy to understand way to do it:
List<string> list = new List<string>();
foreach (string text in str)//loops through your str array
{
string newText =text;
foreach (string word in stop_word) //loops through your word array
{
newText = newText.ToLower().Replace(word, "").Trim();
}
list.Add(newText); //store the results in a list
}
Here is a working Demo

Does this work as you expect?
var results =
str
.Select(x => stop_word.Aggregate(x, (a, y) => a.ToLower().Replace(y, "").Trim()))
.ToArray();
I used this input:
string[] str = new string[]
{
"Please try something-by yourself. before (CAD) asking/",
"cover, was adopted. The accuracy (of) the- change map was"
};
string[] stop_word = new string[]
{
"please", "try", "something", "asking", "-", "(", ")", "/", ".", "was", "the"
};
I got this output:
by yourself before cad
cover, adopted accuracy of change map

You can use Select() for this.
var results = str.Select(x => {
foreach (string word in stop_word)
{
x = x.ToLower().Replace(word, "").Trim();
}
return x;
}).ToList(); // You can use ToArray() if you wish too.
...
foreach(string result in results)
{
Console.WriteLine(result);
}
Result:
by yourself before cad
cover, adopted accuracy of change map

How can I change code inside a <pre></pre> and change it into a table without losing empty lines?

I have been using some code that takes as input HTML and then changes
code inside a <pre> ... </pre> and makes it into a table. Here's the
code:
public static string FormatCode(this string content)
{
var data1 = content
.Split(new[] { "<pre>", "</pre>" }, StringSplitOptions.None);
var data2 = data1
.Select((s, index) =>
{
string s1 = index % 2 == 1 ? string.Format("{0}{2}{1}",
"<table class='code'>", "</table>", SplitJoin(s)) : s;
return s1;
});
var data3 = data2.Where(s => !string.IsNullOrEmpty(s));
var data4 = string.Join("\n", data3);
return data4;
}
private static string SplitJoin(string content)
{
IEnumerable<String> code =
content.Split(new[] { '\n' }, StringSplitOptions.RemoveEmptyEntries)
.Select((line, index) =>
string.Format("<tr><td>{0}</td><td><pre><code>{1}</code></pre></td></tr>\n",
(index + 1).ToString("D2"), HttpUtility.HtmlEncode(line)));
return string.Join("", code) + "\n";
}
If my HTML is like this:
<p>xxx</p><pre>public enum XXX {
private String command1;
private String command2;
}
}</pre>
It converts this into:
<table class="code"><tbody>
<tr><td>01</td><td><p>xxx</p></td></tr>
<tr><td>02</td><td><pre>public enum XXX {</pre></td></tr>
<tr><td>03</td><td><pre> private String command1;</pre></td></tr>
<tr><td>04</td><td><pre> private String command2;</pre></td></tr>
<tr><td>05</td><td><pre>}</pre></td></tr>
</tbody></table>
The problem is that empty line inside a <pre> are not output. Can someone help me
by telling me how I could change my code so that when there is an empty line in the
<pre> then it still outputs a row with a correct row number and something with an
Update: Following a suggested answer I tried making a change to my function to this:
IEnumerable<String> code =
// content.Split(new[] { '\n' }, StringSplitOptions.RemoveEmptyEntries)
content.Split(new[] { '\n' }, StringSplitOptions.None)
.Select((line, index) =>
string.Format("<tr><td>{0}</td><td><pre><code>{1}</code></pre></td></tr>\n",
(index + 1).ToString("D2"), HttpUtility.HtmlEncode(line)));
return string.Join("", code) + "\n";
However I still do not see the empty lines in the tables.

StringSplitOptions.RemoveEmptyEntries removes empty entries when splitting on the newline character. If you don't want to remove empty entries, don't use this option.

Compare String with omitting the blank lines?

I have two strings and need to compare them without checking the blank lines...
First string
CREATE OR REPLACE PROCEDURE "HELL_"
as
begin
dbms_output.put_line('Hello!');
end;
Second string
CREATE OR REPLACE PROCEDURE "USER1"."HELL_"
as
begin
dbms_output.put_line('Hello!');
end;
code that I am using:
string text1 = "";
string text2 = "";
if (text1.Equals(text2 ))
MessageBox.Show("same");
//no Exception
else
{
MessageBox.Show("not");
}

You can split the lines by using StringSplitOptions.RemoveEmptyEntries. The resulting string[] doesn't contain empty lines. Then Enumerable.SequenceEqual is useful.
string[] lines1 = text1.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
string[] lines2 = text2.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
bool equal = lines1.SequenceEqual(lines2);
If the "empty" lines can contain white-spaces:
var lines1 = text1.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)
.Where(l => l.Trim().Length > 0);
var lines2 = text2.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)
.Where(l => l.Trim().Length > 0);
and if you want to ignore white-spaces at all:
var lines1 = text1.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)
.Where(l => l.Trim().Length > 0)
.Select(l => l.Trim());
var lines2 = text2.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)
.Where(l => l.Trim().Length > 0)
.Select(l => l.Trim());
and if you also want to ignore the case:
bool equal = lines1.SequenceEqual(lines2, StringComparer.OrdinalIgnoreCase);

For your specific case this would do the trick:
if (firststring.Equals(secondstring.Text.Replace("\r\n\r\n", "\r\n")))
MessageBox.Show("same");
//no Exception
else
{
MessageBox.Show("not");
}

Along the same line as the other answers (by also "sanitizing" first) but more generally treats "blank lines" as any whitespace-only lines bounded by CR, LF, or any combination of the two.
string RemoveEmptyLines (string s) {
return Regex.Replace(s, #"(?:^|[\r\n]+)\s*?(?=(?:[\r\n]+|$))", "");
}
// Usage
RemoveEmptyLines(a) == RemoveEmptyLines(b)
The line-end characters (i.e. [\r\n]) may be expanded or refined as needed. This regular expression only process one blank line at a time (although all blank lines will be removed within the single Replace call) with a non-greedy quantifier and forward-lookahead. I find that this variation shows the intended operation more explicitly.

how to split a string TWICE

I've been trying to split a string twice but I keep getting the error "Index was outside the bounds of the array".
This is the string I intend to split:
"a*b*c*d*e^1*2*3*4*5^e*f*g*h*i^"
such that I use the "^" as a delimiter in the first array separation so that each set will look as follows after the first result
a*b*c*d*e 1*2*3*4*5 e*f*g*h*i
Then thereafter perform another split operation on this set with * as the separator so that the results, for example from the first set is a b c d e
This is the C# code:
words = "a*b*c*d*e^1*2*3*4*5^e*f*g*h*i^";
char[] del = { '^' };
string[] splitResult = words.Split(del);
foreach (string w in splitResult)
{
char[] separator = { '*' };
string[] splitR = w.Split(separator);
foreach (string e in splitR)
{
string first = splitR[0];
string second = splitR[1];
string third = splitR[2];
string fourth = splitR[3];
string fifth = splitR[4];
}
}

To remove the last part where there is no result, how about
In C#
string str = "a*b*c*d*e^1*2*3*4*5^e*f*g*h*i^";
var result = str.Split(new char[] { '^' }, StringSplitOptions.RemoveEmptyEntries)
.Select(x => x.Split('*')).ToArray();
In VB.Net
Dim str As String = "a*b*c*d*e^1*2*3*4*5^e*f*g*h*i^"
Dim result = str.Split(New Char() {"^"}, StringSplitOptions.RemoveEmptyEntries)
.Select(Function(x) x.Split("*")).ToArray()

You can do this with Linq:
IEnumerable<IEnumerable<string>> strings = words
.Split(new char[] { '^' }, StringSplitOptions.RemoveEmptyEntries)
.Select(w => w.Split('*'));
or if you prefer to work exclusively with arrays
string[][] strings = words
.Split(new char[] { '^' }, StringSplitOptions.RemoveEmptyEntries)
.Select(w => w.Split('*').ToArray())
.ToArray();

string words= "a*b*c*d*e^1*2*3*4*5^e*f*g*h*i^";
string[] reslts = words.Split(new char[] { '*', '^' }, StringSplitOptions.RemoveEmptyEntries);

You have a terminating separator, So the final string is empty.
If (w != null) {
string[] splitR = w.Split(separator);
If splitR.lenght > 4)
{
string first = splitR[0];
string second = splitR[1];
string third = splitR[2];
string fourth = splitR[3];
string fifth = splitR[4];
}
}

Try this:
string words = "a*b*c*d*e^1*2*3*4*5^e*f*g*h*i^";
char[] del = { '^' };
string[] splitResult = words.Split(del,StringSplitOptions.RemoveEmptyEntries);
foreach (string w in splitResult)
{
char[] separator = { '*' };
string[] splitR = w.Split(separator);
if(splitR.Length==5)
{
string first = splitR[0];
string second = splitR[1];
string third = splitR[2];
string fourth = splitR[3];
string fifth = splitR[4];
Console.WriteLine("{0},{1},{2},{3},{4}", first, second, third, fourth, fifth);
}
}

You are getting exception Index was outside the bounds of the array because in the last loop, it is getting only one item, I suggest you to check for five items:
words = "a*b*c*d*e^1*2*3*4*5^e*f*g*h*i^";
char[] del = { '^' };
string[] splitResult = words.Split(del);
foreach (string w in splitResult)
{
char[] separator = { '*' };
string[] splitR = w.Split(separator);
if (splitR.Length>=5)
{
foreach (string e in splitR)
{
string first = splitR[0];
string second = splitR[1];
string third = splitR[2];
string fourth = splitR[3];
string fifth = splitR[4];
}
}
}

One line does it all
var f = words.Split(new char[] { '^' }, StringSplitOptions.RemoveEmptyEntries)
.Select(x => x.Split(new char[] { '*' }).ToArray())
.ToArray();
Your second loop does 5 times same thing (you don't use e).
The exception you got is because a last empty string was included resulting in an empty array that gave the index out of range exception in the inner loop.