Develop Reference

How to find largest word that starts with a capital and add a separator and space

I have code that finds largest word that starts with a capital letter. But I need that word to add a separator and space. Any ideas how I should do it properly?
char[] skyrikliai = { ' ', '.', ',', '!', '?', ':', ';', '(', ')', '\t' };
string eilute = "Arvydas (g. 1964 m. gruodzio 19 d. Kaune)– Lietuvos, krepsininkas, olimpinis ir pasaulio cempionas, nuo 2011 m. spalio 24 d.";
static string Ilgiausias(string eilute, char[] skyrikliai)
{
string[] parts = eilute.Split(skyrikliai,
StringSplitOptions.RemoveEmptyEntries);
string ilgiaus = "";
foreach (string zodis in parts)
if ((zodis.Length > ilgiaus.Length) && (zodis[0].ToString() == zodis[0].ToString().ToUpper()))
ilgiaus = zodis;
return ilgiaus;
}
It should find word Lietuvos and add , and space
Result should be "Lietuvos, "

I would use LINQ for that:
var ilgiaus = parts.Where(s => s[0].IsUpper())
.OrderByDescending(s => s.Length)
.FirstOrDefault();
if(ilgiaus != null) {
return ilgiaus + ", ";
}

Also you can use regex and linq. You dont need to split by many characters.
Regex regex = new Regex(#"[A-Z]\w*");
string str = "Arvydas (g. 1964 m. gruodzio 19 d. Kaune)– Lietuvos, krepsininkas, olimpinis ir pasaulio cempionas, nuo 2011 m. spalio 24 d.";
string longest = regex.Matches(str).Cast<Match>().Select(match => match.Value).MaxBy(val => val.Length);
if you dont want to use MoreLinq, instead of MaxBy(val => val.Length) you can do OrderByDescending(x => x.Length).First()

There are probably more ingenious and elegant ways, but the following pseudocode should work:
List<String> listOfStrings = new List<String>();
// add some strings to the generic list
listOfStrings.Add("bla");
listOfStrings.Add("foo");
listOfStrings.Add("bar");
listOfStrings.Add("Rompecabeza");
listOfStrings.Add("Rumpelstiltskin");
. . .
String longestWorld = String.Empty;
. . .
longestWord = GetLongestCapitalizedWord(listOfStrings);
. . .
private String GetLongestCapitalizedWord(List<String> listOfStrings)
{
foreach (string s in listofstrings)
{
if ((IsCapitalized(s) && (s.Len > longestWord.Len)))
{
longestWord = s;
}
}
}
private bool IsCapitalized(String s)
{
return // true or false
}

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.

Split string to array, remove empty spaces

I have a question about splitting string. I want to split string, but when in string see chars "" then don't split and remove empty spaces.
My String:
String tmp = "abc 123 \"Edk k3\" String;";
Result:
1: abc
2: 123
3: Edkk3 // don't split after "" and remove empty spaces
4: String
My code for result, but I don't know how to remove empty spaces in ""
var tmpList = tmp.Split(new[] { '"' }).SelectMany((s, i) =>
{
if (i % 2 == 1) return new[] { s };
return s.Split(new[] { ' ', ';' }, StringSplitOptions.RemoveEmptyEntries);
}).ToList();
Or but this doesn't see "", so it splits everything
string[] tmpList = tmp.Split(new Char[] { ' ', ';', '\"', ',' }, StringSplitOptions.RemoveEmptyEntries);

Add .Replace(" ","")
String tmp = #"abc 123 ""Edk k3"" String;";
var tmpList = tmp.Split(new[] { '"' }).SelectMany((s, i) =>
{
if (i % 2 == 1) return new[] { s.Replace(" ", "") };
return s.Split(new[] { ' ', ';' }, StringSplitOptions.RemoveEmptyEntries);
}).ToList();

string.Split is not suitable for what you want to do, as you can't tell it to ignore what is in the ".
I wouldn't go with Regex either, as this can get complicated and memory intensive (for long strings).
Implement your own parser - using a state machine to track whether you are within a quoted portion.

You can use a regular expression. Instead of splitting, specify what you want to keep.
Example:
string tmp = "abc 123 \"Edk k3\" String;";
MatchCollection m = Regex.Matches(tmp, #"""(.*?)""|([^ ]+)");
foreach (Match s in m) {
Console.WriteLine(s.Groups[1].Value.Replace(" ", "") + s.Groups[2].Value);
}
Output:
abc
123
Edkk3
String;

Split strings from a text file

I have the following strings in a text file "test"
Table Name.type
Market Drinks.tea
I wana split the strings so that I get the following output
ObjectName = Table AttributeName = Name Attribute Type =type
ObjectName = Market AttributeName = Drinks Attribute Type =tea
here is my code
string[] lines = File.ReadAllLines(#"d:\test.txt");
int i = 0;
var items = from line in lines
where i++ != 0
select new{
objectName = line.Split(new char[] {' '})[0],
attrName = line.Split(new char[]{'.'})[1],
attrType = line.Split(new char[] { ' ' })[2]
};
foreach (var item in items)
{
Console.WriteLine("ObjectName = {0}, AttributeName = {1}, Attribute Type = {2}",
item.objectName, item.attrName, item.attrType);
}
I'm getting an out of boundaries exception.
PS: there are no spaces at the end of the strings in the text file I just wanted to test a character!

You don't need the new char[] { ... } surrounding because String.Split() uses params
To fix the index-out-of-bounds, the last part of the select should become:
attrType = line.Split(' ', '.' )[2]
Edit
And thanks to #Kobi, a let will let you do the Split just once, a great improvement when you have many rows and/or columns.
var items = from line in lines
where i++ != 0
let words = line.Split(' ', '.')
select new
{
objectName = words[0],
attrName = words[1],
attrType = words[2]
};
Old answer
You can use the same Split for all 3 parts, making it a little easier to read:
select new{
objectName = line.Split(' ', '.' )[0],
attrName = line.Split(' ', '.' )[1],
attrType = line.Split(' ', '.' )[2]
};

Use regular expressions which is more robust:
static void Main()
{
const string PATTERN = #"^([\w]+)\s+([\w]+)\.(\w+)";
const string TEXT = "Table Name.type\r\nMarket Drinks.tea";
foreach (Match match in Regex.Matches(TEXT, PATTERN, RegexOptions.Multiline))
{
Console.WriteLine("ObjectName = {0} AttributeName = {1} Attribute Type ={2}",
match.Groups[1].Value, match.Groups[2].Value, match.Groups[3].Value);
}
}
Outputs:
ObjectName = Table AttributeName = Name Attribute Type =type
ObjectName = Market AttributeName = Drinks Attribute Type =tea

On the splitting part, you should do it like this (provided you are sure your input is in the correct format):
attrName = line.Split(' ')[1].Split('.')[0],
attrType = line.Split(' ')[1].Split('.')[1]

The out of bounds is on this line - attrType = line.Split(new char[] { ' ' })[2]
your attrType should be = line.Split(new char[] { '.' } )[1];
attrName should be = line.Split(new char[] {' '})[1].Split(new char[] {'.'})[0]
As Henk Holterman has said, you dont need to use new char[] inside split so your lines would be -
attrType = line.Split('.')[1];
attrName = line.Split(' ')[1].Split('.')[0];

thx to the replies here is the right answer for the desired output
objectName = line.Split(' ')[0],
attrName = line.Split(' ')[1].Split('.')[0],
attrType = line.Split('.')[1]

if you want to do in this way just use Regex its more flexible
const string pattern = #"(?<objectName>\w+)\s(?<attrName>\w+)\.(?<attrType>\w+)";
string[] lines = File.ReadAllLines(#"e:\a.txt");
var items = from line in lines
select new
{
objectName = Regex.Match(line, pattern).Groups["objectName"].Value,
attrName = Regex.Match(line, pattern).Groups["attrName"].Value,
attrType = Regex.Match(line, pattern).Groups["attrType"].Value
};
foreach (var item in items.ToList())
{
Console.WriteLine("ObjectName = {0}, AttributeName = {1}, Attribute Type = {2}",
item.objectName, item.attrName, item.attrType);
}

How can I reduce these four lines of code that splits/trims a semicolon list to one line?

How can I do this:
string list = "one; two; three;four";
List<string> values = new List<string>();
string[] tempValues = list.Split(new char[] {';'}, StringSplitOptions.RemoveEmptyEntries);
foreach (string tempValue in tempValues)
{
values.Add(tempValue.Trim());
}
in one line, something like this:
List<string> values = extras.Split(';').ToList().ForEach( x => x.Trim()); //error

You need to use Select if you want to perform a transformation on each instance in the IEnumerable<T>.
List<string> values = list.Split(new char[] {';'}, StringSplitOptions.RemoveEmptyEntries).Select(x => x.Trim()).ToList();

Easy -- use the LINQ select method:
var values = "one; two; three;four".Split(new char[] {';'}, StringSplitOptions.RemoveEmptyEntries).Select(str => str.Trim());

List<string> values = new List<string>(list.Split(new char[] { ';', ' ' }, StringSplitOptions.RemoveEmptyEntries));
No explicit Trim() is necessary. Nor is LINQ. Add \t, \r, \n to the char[] if other whitespace may be present.