Develop Reference

How to get a and b value from a text like axb?

I am facing a problem with how to get a specific string value from a text. For example: for a given string
"400X500 abc"
How can I get some string from that text like:
string width = "400"
string height = "500"
Thank you so much for your help.
Best Regards,
Cherry Truong

You can try regular expressions in order to extract numbers
using System.Text.RegularExpressions;
...
string source = "400X500 abc";
string[] numbers = Regex
.Matches(source, "[0-9]+")
.OfType<Match>()
.Select(match => match.Value)
.ToArray();
string width = numbers.ElementAtOrDefault(0) ?? "";
string height = numbers.ElementAtOrDefault(1) ?? "";
Or (if you want to be sure that X delimiter is present)
Match match = Regex
.Match(source, #"([0-9]+)\s*X\s*([0-9]+)", RegexOptions.IgnoreCase);
string width = match.Success ? match.Groups[1].Value : "";
string height = match.Success ? match.Groups[2].Value : "";

You can try something like this:
string data = "400X500 abc";
string[] splitData = data.TrimEnd('a', 'b', 'c').Trim().Split('X');
string width = splitData[0] ?? string.Empty;
string height = splitData[1] ?? string.Empty;

If you can assume that it will always be in that format, you can do something like this:
string raw = "400X500";
string width = raw.Substring(0, raw.IndexOf("X"));
string height = raw.Substring(raw.IndexOf("X") + 1);
Now width="400" and height=500.

Assuming the text is always going to be in the format "100X200 aabdsafgds", then a working solution would look something like:
var value = "100X200 aabdsafgds";
var splitValues = value.Split(new[] { 'X', ' ' }, StringSplitOptions.RemoveEmptyEntries);
var value1 = splitValues[0];
var value2 = splitValues[1];

I assume the input string is always in the same format.
"heightXwidth abc"
var value = "400X500 abc";
var vals = value.Trim().Split('X');
var height = new string(vals[0] == null ? "0".ToArray() : vals[0].Where(char.IsDigit).ToArray());
var width = new string(vals[1] == null ? "0".ToArray() : vals[1].Where(char.IsDigit).ToArray());
I'm sure you could adjust as needed.
EDIT:
I adjusted the code to avoid the issues as pointed out in the comments and ensure you only get the numbers from the string

Get the substring of the non conditional part

I have this string for example:
2X+4+(2+2X+4X) +4
The position of the parenthesis can vary. I want to find out how can I extract the part without the parenthesis. For example I want 2X+4+4. Any Suggestions?
I am using C#.

Try simple string Index and Substring operations as follows:
string s = "2X+4+(2+2X+4X)+4";
int beginIndex = s.IndexOf("(");
int endIndex = s.IndexOf(")");
string firstPart = s.Substring(0,beginIndex-1);
string secondPart = s.Substring(endIndex+1,s.Length-endIndex-1);
var result = firstPart + secondPart;
Explanation:
Get the first index of (
Get the first index of )
Create two sub-string, first one is 1 index before beginIndex to remove the mathematical symbol like +
Second one is post endIndex, till string length
Concatenate the two string top get the final result

Try Regex approach:
var str = "(1x+2)-2X+4+(2+2X+4X)+4+(3X+3)";
var regex = new Regex(#"\(\S+?\)\W?");//matches '(1x+2)-', '(2+2X+4X)+', '(3X+3)'
var result = regex.Replace(str, "");//replaces parts above by blank strings: '2X+4+4+'
result = new Regex(#"\W$").Replace(result, "");//replaces last operation '2X+4+4+', if needed
//2X+4+4 ^

Try this one:
var str = "(7X+2)+2X+4+(2+2X+(3X+3)+4X)+4+(3X+3)";
var result =
str
.Aggregate(
new { Result = "", depth = 0 },
(a, x) =>
new
{
Result = a.depth == 0 && x != '(' ? a.Result + x : a.Result,
depth = a.depth + (x == '(' ? 1 : (x == ')' ? -1 : 0))
})
.Result
.Trim('+')
.Replace("++", "+");
//result == "2X+4+4"
This handles nested, preceding, and trailing parenthesis.

How to separate sting with comma plus 8 digits

I want to split a long string (that contains only numbers) to string arr 0f numbers with 8 digits after the comma.
for example:
input:
string str = "45.00019821162.206580920.032150970.03215097244.0031982274.245303020.014716900.046867870.000198351974.613444580.391664580.438532450.00020199 3499.19734739 0.706802871.145335320.000202002543.362378010.513759201.659094520.000202102.391733720.000483371.65957789"
output:
string[] Arr=
"
45.00019821 162.20658092 234.03215097 123123.03215097
255.00019822 74.24530302 23422.01471690 1.04686787
12.00019835 1974.61344458 234.39166458 123212.43853245
532.00020199 3499.19734739 878.70680287 1.14533532
1234.00020200 2543.36237801 23.51375920 1.65909452
12221.00020210 2.39173372 0.00048337 1.65957789"
EDIT:
I try use
String.Format("{0:0.00000000}", str);
or some SubString such as:
public static string GetSubstring(string input, int count, char delimiter)
{
return string.Join(delimiter.ToString(), input.Split(delimiter).Take(count));
}
with no success.

You can split the string using Regex:
var strRegex = #"(?<num>\d+\.\d{8})";
var myRegex = new Regex(strRegex, RegexOptions.None);
foreach (Match myMatch in myRegex.Matches(str))
{
var part = myMatch.Groups["num"].Value;
// convert 'part' to double and store it wherever you want...
}
More compact version:
var myRegex = new Regex(#"(?<num>\d*\.\d{8})", RegexOptions.None);
var myNumbers = myRegex.Matches(str).Cast<Match>()
.Select(m => m.Groups["num"].Value)
.Select(v => Convert.ToDouble(v, CultureInfo.InvariantCulture));

The input string str can be converted to the desired output as follows.
static IEnumerable<string> NumberParts(string iString)
{
IEnumerable<char> iSeq = iString;
while (iSeq.Count() > 0)
{
var Result = new String(iSeq.TakeWhile(Char.IsDigit).ToArray());
iSeq = iSeq.SkipWhile(Char.IsDigit);
Result += new String(iSeq.Take(1).ToArray());
iSeq = iSeq.Skip(1);
Result += new String(iSeq.Take(8).ToArray());
iSeq = iSeq.Skip(8);
yield return Result;
}
}
The parsing method above can be called as follows.
var Parts = NumberParts(str).ToArray();
var Result = String.Join(" ", Parts);

This would be the classical for-loop version of it, (no magic involved):
// split by separator
string[] allparts = str.Split('.');
// Container for the resulting numbers
List<string> numbers = new List<string>();
// Handle the first number separately
string start = allparts[0];
string decimalPart ="";
for (int i = 1; i < allparts.Length; i++)
{
decimalPart = allparts[i].Substring(0, 8);
numbers.Add(start + "." + decimalPart);
// overwrite the start with the next number
start = allparts[i].Substring(8, allparts[i].Length - 8);
}
EDIT:
Here would be a LINQ Version yielding the same result:
// split by separator
string[] allparts = str.Split('.');
IEnumerable<string> allInteger = allparts.Select(x => x.Length > 8 ? x.Substring(8, x.Length - 8) : x);
IEnumerable<string> allDecimals = allparts.Skip(1).Select(x => x.Substring(0,8));
string [] allWholeNumbers = allInteger.Zip(allDecimals, (i, d) => i + "." + d).ToArray();

The shortest way without regex:
var splitted = ("00000000" + str.Replace(" ", "")).Split('.');
var result = splitted
.Zip(splitted.Skip(1), (f, s) =>
string.Concat(f.Skip(8).Concat(".").Concat(s.Take(8))))
.ToList()
Try it online!

Extract table name from schema and table name

I'm trying to get the table name from a string that is in the format:
[schemaname].[tablename]
I think this can be done with split but not sure how to handle the trailing ] character.

A simple approach is using String.Split and String.Trim in this little LINQ query:
string input = "[schemaname].[tablename]";
string[] schemaAndTable = input.Split('.')
.Select(t => t.Trim('[', ']'))
.ToArray();
string schema = schemaAndTable[0];
string table = schemaAndTable[1];
Another one using IndexOf and Substring:
int pointIndex = input.IndexOf('.');
if(pointIndex >= 0)
{
string schema = input.Substring(0, pointIndex).Trim('[', ']');
string table = input.Substring(pointIndex + 1).Trim('[', ']');
}

//find the seperator
var pos = str.IndexOf('].[');
if (pos == -1)
return null; //sorry, can't be found.
//copy everything from the find position, but ignore ].[
// and also ignore the last ]
var tableName = str.Substr(pos + 3, str.Length - pos - 4);

Just to be the different here is another version with regex;
var result = Regex.Match(s, #"(?<=\.\[)\w+").Value;

Split by 3 characters. i.e [.] with option RemoveEmptyEntries that is pretty self explanatory.
var result = input.Split(new [] {'[','.',']'}, StringSplitOptions.RemoveEmptyEntries);

Try this:
var tableAndSchema = "[schemaname].[tablename]";
var tableName = tableAndSchema
.Split('.')[1]
.TrimStart('[')
.TrimEnd(']');
Split will split the string on the . character and turn it into an array of two strings:
[0] = "[schemaname]"
[1] = "[tablename]"
The second (index 1) element is the one you want. TrimStart and TrimEnd will remove the starting and ending brackets.
Another way to do this is with Regular Expressions:
var tableAndSchema = "[schemaname].[tablename]";
var regex = new Regex(#"\[.*\].\[(.*)\]");
var tableName = regex.Match(tableAndSchema).Groups[1];
The regex pattern \[.*\].\[(.*)\] creates a capture group for the characters within the second pair of brackets and lets you easily pull them out.

var res = input.Split('.')[1].Trim('[', ']');
Another LINQ solution:
var tableName = String.Join("", input.SkipWhile(c => c != '.').Skip(1)
.Where(c => Char.IsLetter(c)));

How to check a String for characters NOT to be included in C#

So I have a String like:
String myString = "AAAaAAA";
I want to check the String if it contains ANY characters that are not "A"
How can I do this? my previous code is:
Regex myChecker = new Regex("[^A.$]$");
if (checkForIncluded.IsMatch(myString))
{
//Do some Stuff
}
Is there any other way to do it? The code above does not detect the small a. But when I use a different String with only characters that are not "A" it works. Thank you!

String myString = "AAAaAAA";
if(myString.Any(x => x != 'A')) {
// Yep, contains some non-'A' character
}

Try something like this:
var allowedChars = new List<char>() { 'a', 'b', 'c' };
var myString = "abcA";
var result = myString.Any(c => !allowedChars.Contains(c));
if (result) {
// myString contains something not in allowed chars
}
or even like this:
if (myString.Except(allowedChars).Any()) {
// ...
}
allowedChars can be any IEnumerable< char >.

I want to check the String if it contains ANY characters that are not
"A"
You can use Enumerable.Any like;
string myString = "AAAaAAA";
bool b = myString.Any(s => !s.Equals('A')); // True

You can use Linq:
String myString = "AAAaAAA";
var result = myString.Where(x=>x != 'A'); // return all character that are not A
if(result.Count() > 0)
{
Console.WriteLine("Characters exists other than a");
}
if you want both cases:
String myString = "AAAaAAA";
var result = myString.Where(x=>x != 'A' || x != 'a');
or Use String.Equals():
var result = myString.Where(x => !String.Equals(x.ToString(), "A", StringComparison.OrdinalIgnoreCase));

Your regular expression is only trying to match the last character. This should work:
var myString = "AAaA";
bool anyNotAs = Regex.IsMatch(myString, "[^A]", RegexOptions.None);