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how to split string using LINQ [duplicate]

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How to split a string using LINQ
(4 answers)
Closed 5 years ago.
I have one string having numbers and alphabets want to split alphabets and digits in separate array using LINQ query in C# .my string is as
"abcd 00001 pqr 003 xyz abc 0009"

you could transform the string to an char array and then use the Where clause to extract the necessary information:
string g = "abcd 00001 pqr 003 xyz abc 0009";
char[] numbers = g.ToCharArray().Where(x => char.IsNumber(x)).ToArray();
char[] letters = g.ToCharArray().Where(x=> char.IsLetter(x)).ToArray();

You can do it in this way:
string a ="abcd 00001 pqr 003 xyz abc 0009";
var digits = a.Split().Where(x=> {double number; return double.TryParse(x,out number);});
var letters = a.Split().Where(x=> {double number; return !double.TryParse(x,out number);});
foreach(var a1 in digits)
{
Console.WriteLine(a1);
}
foreach(var a1 in letters)
{
Console.WriteLine(a1);
}
The idea is to try to Parse the character and if it is parsed successful then it's a number.

You can use GroupBy where the Key is a boolean that specifies if the entry is a number(Can be converted to a double) or text:
string input = "abcd 00001 pqr 003 xyz abc 0009";
double dummy;
var result = input.Split().GroupBy(i => double.TryParse(i, out dummy)).ToList();
var textArray = result.Where(i => !i.Key).SelectMany(i=> i).ToArray();
var numberArray = result.Where(i => i.Key).SelectMany(i => i.ToList()).ToArray();

To Count Occurrences of all sub strings in string C#

Question: I have a long string and I require to find the count of occurrences of all sub strings present under that string and print a list of all sub strings and their count (if count is > 1) in decreasing order of count.
Example:
String = "abcdabcd"
Result:
Substrings Count
abcd 2
abc 2
bcd 2
ab 2
bc 2
cd 2
a 2
b 2
c 2
d 2
Problem: My string can be 5000 character long and I am not able to find a efficient way to achieve this.( Efficiency is very important for application)
Is there any algorithm present or by multi threading it is possible. please help.

Example using: Find a common string within a list of strings
void Main()
{
"abcdabcd".getAllSubstrings()
.AsParallel()
.GroupBy(x => x)
.Select(g => new {g.Key, count=g.Count()})
.Dump();
}
// Define other methods and classes here
public static class Ext
{
public static IEnumerable<string> getAllSubstrings(this string word)
{
return from charIndex1 in Enumerable.Range(0, word.Length)
from charIndex2 in Enumerable.Range(0, word.Length - charIndex1 + 1)
where charIndex2 > 0
select word.Substring(charIndex1, charIndex2);
}
}
Produces:
a 2
dabc 1
abcdabc 1
b 2
abc 2
dabcd 1
bc 2
bcda 1
abcd 2
ab 2
bcdab 1
cdabc 1
abcda 1
d 2
bcdabc 1
dab 1
bcd 2
abcdab 1
c 2
bcdabcd 1
abcdabcd 1
cd 2
da 1
cdab 1
cda 1
cdabcd 1

Remove single alphabets from a string

I need help in removing letters but not words from an incoming data string. Like the following,
String A = "1 2 3A 4 5C 6 ABCD EFGH 7 8D 9";
to
String A = "1 2 3 4 5 6 ABCD EFGH 7 8 9";

You need to match a letter and ensure that there is no letter before and after. So match
(?<!\p{L})\p{L}(?!\p{L})
and replace with an empty string.
Look around assertions on regular-expresssion.info
Unicode properties on regular-expresssion.info
In C#:
string s = "1 2 3A 4 5C 6 ABCD EFGH 7 8D 9";
string result = Regex.Replace(s, #"(?<!\p{L}) # Negative lookbehind assertion to ensure not a letter before
\p{L} # Unicode property, matches a letter in any language
(?!\p{L}) # Negative lookahead assertion to ensure not a letter following
", String.Empty, RegexOptions.IgnorePatternWhitespace);

The "obligatory" Linq approach:
string[] words = A.Split();
string result = string.Join(" ",
words.Select(w => w.Any(c => Char.IsDigit(c)) ?
new string(w.Where(c => Char.IsDigit(c)).ToArray()) : w));
This approach looks if each word contains a digit. Then it filters out the non-digit chars and creates a new string from the result. Otherwise it just takes the word.

And here comes the old school:
Dim A As String = "1 2 3A 4 5C 6 ABCD EFGH 7 8D 9"
Dim B As String = "1 2 3 4 5 6 ABCD EFGH 7 8 9"
Dim sb As New StringBuilder
Dim letterCount As Integer = 0
For i = 0 To A.Length - 1
Dim ch As Char = CStr(A(i)).ToLower
If ch >= "a" And ch <= "z" Then
letterCount += 1
Else
If letterCount > 1 Then sb.Append(A.Substring(i - letterCount, letterCount))
letterCount = 0
sb.Append(A(i))
End If
Next
Debug.WriteLine(B = sb.ToString) 'prints True

How to get input separated by spaces

I want to try and get a line of numbers and count them and store them in an array. I want to have the user input numbers up to 100 and I want the program to be able to separate them by spaces and count them in C#
Example: 98 92 86 92 100 92 93
The spaces will be the only separator and it would count 7 grades and store them in an array but I'm not sure how to to really do this.

Not to get empty entries in case of 2 spaces
var ints = input.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
.Select(i => int.Parse(i))
.ToList(); //or ToArray() whichever you want

Since you want an Array on this, use Split function.
string x = "98 92 86 92 100 92 93";
string[] val = x.Split(' ');
int totalCount = val.Length;
or a better way to do this is by using LINQ which automatically converts into array of integers
string x = "98 92 86 92 100 92 93";
int[] y = x.Split(' ').Select(n => Convert.ToInt32(n)).ToArray();
int totalCount = y.Length;

How to get value from number tagged file and compare it?

hi i'm trying to extract values from this tagged file
here is the file
0
LINE
5
1C1CBD
330
1C1ADB
100
AcDbEntity
8
0-FD
62
9
370
-2
100
AcDbLine
10
53740.73468153231
20
-190253.3098529756
30
0.0
11
53690.49919802765
21
-190166.2994431953
31
0.0
0
you can see that there is a hexadecimal number below "LINE", is there anyway i can extract it into some list?
like
VALUE = 1C1CBD
NOTE: the file consist more than one of this kind of pattern
and then how can i get the maximum value?
EDIT 1
i see that "5" can be found by using regex "\s\s5" can i use this?

Thank you for your feedback i have been able to complete what i want
here is the code
string[] handle = originalString.Split(new string[] { "\r\n" }, StringSplitOptions.None);
List<string> hexa = new List<string>();
for (var a = 1; a <= handle.Count() - 1; a++)
{
if (Regex.IsMatch(handle[a], #"^\s\s5"))
{
hexa.Add(handle[a + 1]);
}
}
List<int> HexaToInt = new List<int>();
foreach (string valueHexa in hexa)
{
int intHexaValue = int.Parse(valueHexa, System.Globalization.NumberStyles.HexNumber);
HexaToInt.Add(intHexaValue);
}
int maximumHexa = HexaToInt.Max();
string hexValue = maximumHexa.ToString("X");
it is possible afterall to extract the hexadecimal value from the handle group codes

It is totally impossible.
No way to catch characters and extract what you need.
You have to organize the structure of this file better.