I can't seem to find a good solution to this issue. I've got an array of strings that are fed in from a report that I recieve about lost or stolen equipment. I've been using the string.IndexOf function through the rest of the form and it works quite well. This issue is with the field that says if the device was lost or stolen.
Example:
"Lost or Stolen? Lost"
"Lost or Stolen? Stolen"
I need to be able to read this but when I do string.IndexOf(#"Lost") it will always return lost because it's in the question.
Unfortunately I'm not able to change the form itself in any way and due to the nature of how it's submited I can't just write code the knocks the first 15 or so characters off the string because that may be too few in some cases.
I would really like something in C# that would allow me to continue to search a string after the first result is found so that the logic would look like:
string my_string = "Lost or Stolen? Stolen";
searchFor(#"Stolen" in my_string)
{
Found Stolen;
Does it have "or " infront of it? yes;
ignore and keep searching;
Found Stolen again;
return "Equipment stolen";
}
Couple of options here. You could look for the last index of a space and take the rest of the string:
string input = "Lost or Stolen? Stolen";
int lastSpaceIndex = input.LastIndexOf(' ');
string result = input.Substring(lastSpaceIndex + 1);
Console.WriteLine(result);
Or you could split it and take the last word:
string input = "Lost or Stolen? Lost";
string result = input.Split(' ').Last();
Console.WriteLine(result);
Regex is also an option, but overkill given the simpler solutions above. A nice shortcut that fits this scenario is to use the RegexOptions.RightToLeft option to get the first match starting from the right:
string result = Regex.Match(input, #"\w+", RegexOptions.RightToLeft).Value;
If I understand your requirement, you're looking for an instance of Lost or Stolen after a ?:
var q = myString.IndexOf("?");
var lost = q >= 0 && myString.IndexOf("Lost", q) > 0;
var stolen = q >= 0 && myString.IndexOf("Stolen", q) > 0;
// or
var lost = myString.LastIndexOf("Lost") > myString.IndexOf("?");
var stolen = myString.LastIndexOf("Stolen") > myString.IndexOf("?");
// don't forget
var neither = !lost && !stolen;
You can look for the string 'Lost' and if it occurs twice, then you can confirm it is 'Lost'.
Its possible in this case that you could use index of on a substring knowing that it is always going to say lost or stolen first
so you parse out the lost or stolen, then like for you keyword to match the remaining string.
something like:
int questionIndex = inputValue.indexOf("?");
string toMatch = inputValue.Substring(questionIndex);
if(toMatch == "Lost")
If it works for your use case, it might be easier to use .EndsWith().
bool lost = my_string.EndsWith("Lost");
Related
I have a simple problem, but I could not find a simple solution yet.
I have a string containing for example this
UNB+123UNH+234BGM+345DTM+456
The actual string is lots larger, but you get the idea
now I have a set of values I need to find in this string
for example UNH and BGM and DTM and so on
So I need to search in the large string, and find the position of the first set of values.
something like this (not existing but to explain the idea)
string[] chars = {"UNH", "BGM", "DTM" };
int pos = test.IndexOfAny(chars);
in this case pos would be 8 because from all 3 substrings, UNH is the first occurrence in the variable test
What I actually trying to accomplish is splitting the large string into a list of strings, but the delimiter can be one of many values ("BGM", "UNH", "DTM")
So the result would be
UNB+123
UNH+234
BGM+345
DTM+456
I can off course build a loop that does IndexOf for each of the substrings, and then remember the smallest value, but that seems so inefficient. I am hoping for a better way to do this
EDIT
the substrings to search for are always 3 letters, but the text in between can be anything at all with any length
EDIT
It are always 3 alfanumeric characters, and then anything can be there, also lots of + signs
You will find more problems with EDI than just splitting into corresponding fields, what about conditions or multiple values or lists?. I recommend you to take a look at EDI.net
EDIT:
EDIFact is a format pretty complex to just use regex, as I mentioned before, you will have conditions for each format/field/process, you will need to catch the whole field in order to really parse it, means as example DTM can have one specific datetime format and in another EDI can have a DateTime format totally different.
However, this is the structure of a DTM field:
DTM DATE/TIME/PERIOD
Function: To specify date, and/or time, or period.
010 C507 DATE/TIME/PERIOD M 1
2005 Date or time or period function code
qualifier M an..3
2380 Date or time or period text C an..35
2379 Date or time or period format code C an..3
So you will have always something like 'DTM+d3:d35:d3' to search for.
Really, it doesn't worth the struggle, use EDI.net, create your own POCO classes and work from there.
Friendly reminder that EDIFact changes every 6 months on Europe.
If the separators can be any one of UNB, UNH, BGM, or DTM, the following Regex could work:
foreach (Match match in Regex.Matches(input, #"(UNB|UNH|BGM|DTM).+?(?=(UNB|UNH|BGM|DTM)|$)"))
{
Console.WriteLine(match.Value);
}
Explanation:
(UNB|UNH|BGM|DTM) matches either of the separators
.+? matches any string with at least one character (but as short as possible)
(?=(UNB|UNH|BGM|DTM)|$) matches if either a separator follows or if the string ends there - the match is however not included in the value.
It sounds like the other answer recognises the format - you should definitely consider a library specifically for parsing this format!
If you're intent on parsing it yourself, you could simply find the index of your identifiers in the string, determine the first 2 by position, and use those positions to Substring the original input
var input = "UNB+123UNH+234BGM+345DTM+456";
var chars = new[]{"UNH", "BGM", "DTM" };
var indexes = chars.Select(c => new{Length=c.Length,Position= input.IndexOf(c)}) // Get position and length of each input
.Where(x => x.Position>-1) // where there is actually a match
.OrderBy(x =>x.Position) // put them in order of the position in the input
.Take(2) // only interested in first 2
.ToArray(); // make it an array
if(indexes.Length < 2)
throw new Exception("Did not find 2");
var result = input.Substring(indexes[0].Position + indexes[0].Length, indexes[1].Position - indexes[0].Position - indexes[0].Length);
Live example: https://dotnetfiddle.net/tDiQLG
There is already a lot of answers here, but I took the time to write mine so might as well post it even if it's not as elegant.
The code assumes all tags are accounted for in the chars array.
string str = "UNB+123UNH+234BGM+345DTM+456";
string[] chars = { "UNH", "BGM", "DTM" };
var locations = chars.Select(o => str.IndexOf(o)).Where(i => i > -1).OrderBy(o => o);
var resultList = new List<string>();
for(int i = 0;i < locations.Count();i++)
{
var nextIndex = locations.ElementAtOrDefault(i + 1);
nextIndex = nextIndex > 0 ? nextIndex : str.Length;
nextIndex = nextIndex - locations.ElementAt(i);
resultList.Add(str.Substring(locations.ElementAt(i), nextIndex));
}
This is a fairly efficient O(n) solution using a HashSet
It's extremely simple, low allocations, more efficient than regex, and doesn't need a library
Given
private static HashSet<string> _set;
public static IEnumerable<string> Split(string input)
{
var last = 0;
for (int i = 0; i < input.Length-3; i++)
{
if (!_set.Contains(input.Substring(i, 3))) continue;
yield return input.Substring(last, i - last);
last = i;
}
yield return input.Substring(last);
}
Usage
_set = new HashSet<string>(new []{ "UNH", "BGM", "DTM" });
var results = Split("UNB+123UNH+234BGM+345DTM+456");
foreach (var item in results)
Console.WriteLine(item);
Output
UNB+123
UNH+234
BGM+345
DTM+456
Full Demo Here
Note : You could get this faster with a simple sorted tree, but would require more effort
string text = "Today is a good day for help. **David Diaz He went to school. **David Diaz like apple. ";
How to get how many times the text **David Diaz occurs in the string text?
UPDATED MY QUESTION
By using StartWhith you can check if the string starts whit ** if it is take the first two words of the string whits will represent the name
string text = "**David Diaz He went to school.";
if (text.StartsWith("**"))
{
var names = text.Split(' ')
.Take(2)
.ToArray();
var fullName = names[0] + " " + names[1];
}
UPDATE
As you said in the commend you want to look how many David Diaz occurs in one string, you can use regex for that.
string text = "Today is a good day for help. **David Diaz He went to school. **David Diaz like apple. ";
int matches = Regex.Matches(
text,
#"(?:\S+\s)?\S*David Diaz\S*(?:\s\S+)?",
RegexOptions.IgnoreCase
).Count;
var text = "Today is a good day for help. **David Diaz He went to school. **David Diaz like apple. ";
var pos = 0;
var num = 0;
var search = "**David Diaz";
while ((pos = text.IndexOf(search, pos)) > -1)
{
num ++;
pos += search.Length;
}
Console.WriteLine(num);
you can try out this in dotnetfiddle
Updated Answer:
It sounds like you want to find the number of times a substring exists in your text. For that, you'll want to use RegEx.Matches, as explained in this answer: https://stackoverflow.com/a/3016577/682840
or LINQ, as explained in this answer: https://stackoverflow.com/a/541994/682840
Original Answer:
.StartsWith returns true/false if the string begins with the search string you provide. If you're wanting to know where a substring exists within your text, you'll need to use .IndexOf or a Regular Expression for more advanced scenarios.
IndexOf will return the location in the text where your provided search string starts (or -1 if it isn't found).
I have a text file that contain only the FULL version number of an application that I need to extract and then parse it into separate Variables.
For example lets say the version.cs contains 19.1.354.6
Code I'm using does not seem to be working:
char[] delimiter = { '.' };
string currentVersion = System.IO.File.ReadAllText(#"C:\Applicaion\version.cs");
string[] partsVersion;
partsVersion = currentVersion.Split(delimiter);
string majorVersion = partsVersion[0];
string minorVersion = partsVersion[1];
string buildVersion = partsVersion[2];
string revisVersion = partsVersion[3];
Altough your problem is with the file, most likely it contains other text than a version, why dont you use Version class which is absolutely for this kind of tasks.
var version = new Version("19.1.354.6");
var major = version.Major; // etc..
What you have works fine with the correct input, so I would suggest making sure there is nothing else in the file you're reading.
In the future, please provide error information, since we can't usually tell exactly what you expect to happen, only what we know should happen.
In light of that, I would also suggest looking into using Regex for parsing in the future. In my opinion, it provides a much more flexible solution for your needs. Here's an example of regex to use:
var regex = new Regex(#"([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9])");
var match = regex.Match("19.1.354.6");
if (match.Success)
{
Console.WriteLine("Match[1]: "+match.Groups[1].Value);
Console.WriteLine("Match[2]: "+match.Groups[2].Value);
Console.WriteLine("Match[3]: "+match.Groups[3].Value);
Console.WriteLine("Match[4]: "+match.Groups[4].Value);
}
else
{
Console.WriteLine("No match found");
}
which outputs the following:
// Match[1]: 19
// Match[2]: 1
// Match[3]: 354
// Match[4]: 6
I am really a beginner, I already know
string.indexOf("");
Can search for a whole word, but when I tried to search for e.g: ig out of pig, it doesn't work.
I have a similar string here(part of):
<Special!>The moon is crashing to the Earth!</Special!>
Because I have a lot of these in my file and I just cannot edited all of them and add a space like:
< Special! > The moon is crashing to the Earth! </ Special! >
I need to get the sub-string of Special! and The moon is crashing to the Earth!
What is the simple way to search for a part of a word without adding plugins like HTMLAgilityPack?
IndexOf will work, you are probably just using it improperly.
If your string is in a variable call mystring you would say mystring.IndexOf and then pass in the string you are looking for.
string mystring = "somestring";
int position = mystring.IndexOf("st");
How are you using it? You should use like this:
string test = "pig";
int result = test.IndexOf("ig");
// result = 1
If you want to make it case insensitive use
string test = "PIG";
int result = test.IndexOf("ig", StringComparison.InvariantCultureIgnoreCase);
// result = 1
String.IndexOf Method - MSDN
Please try this:
string s = "<Special!>The moon is crashing to the Earth!</Special!>";
int whereMyStringStarts = s.IndexOf("moon is crashing");
IndexOf should work with spaces too, but maybe you have new line or tab characters, not spaces?
Sometimes case-sensitivity is important. You may control it by additional parameter called comparisonType. Example:
int whereMyStringStarts = s.IndexOf("Special", StringComparison.OrdinalIgnoreCase);
More information about IndexOf: String.IndexOf Method at MSDN
Anyway, I think you may need regular expressions to create better parser. IndexOf is very primitive method and you may stuck in big mess of code.
string page = "<Special!>The moon is crashing to the Earth!</Special!>";
if (page.Contains("</Special!>"))
{
pos = page.IndexOf("<Special!>");
propertyAddress = page.Substring(10, page.IndexOf("</Special!>")-11);
//i used 10 because <special!> is 10 chars, i used 11 because </special!> is 11
}
This will give you "the moon is crashing to the earth!"
I feel kind of dumb posting this when this seems kind of simple and there are tons of questions on strings/characters/regex, but I couldn't find quite what I needed (except in another language: Remove All Text After Certain Point).
I've got the following code:
[Test]
public void stringManipulation()
{
String filename = "testpage.aspx";
String currentFullUrl = "http://localhost:2000/somefolder/myrep/test.aspx?q=qvalue";
String fullUrlWithoutQueryString = currentFullUrl.Replace("?.*", "");
String urlWithoutPageName = fullUrlWithoutQueryString.Remove(fullUrlWithoutQueryString.Length - filename.Length);
String expected = "http://localhost:2000/somefolder/myrep/";
String actual = urlWithoutPageName;
Assert.AreEqual(expected, actual);
}
I tried the solution in the question above (hoping the syntax would be the same!) but nope. I want to first remove the queryString which could be any variable length, then remove the page name, which again could be any length.
How can I get the remove the query string from the full URL such that this test passes?
For string manipulation, if you just want to kill everything after the ?, you can do this
string input = "http://www.somesite.com/somepage.aspx?whatever";
int index = input.IndexOf("?");
if (index >= 0)
input = input.Substring(0, index);
Edit: If everything after the last slash, do something like
string input = "http://www.somesite.com/somepage.aspx?whatever";
int index = input.LastIndexOf("/");
if (index >= 0)
input = input.Substring(0, index); // or index + 1 to keep slash
Alternately, since you're working with a URL, you can do something with it like this code
System.Uri uri = new Uri("http://www.somesite.com/what/test.aspx?hello=1");
string fixedUri = uri.AbsoluteUri.Replace(uri.Query, string.Empty);
To remove everything before the first /
input = input.Substring(input.IndexOf("/"));
To remove everything after the first /
input = input.Substring(0, input.IndexOf("/") + 1);
To remove everything before the last /
input = input.Substring(input.LastIndexOf("/"));
To remove everything after the last /
input = input.Substring(0, input.LastIndexOf("/") + 1);
An even more simpler solution for removing characters after a specified char is to use the String.Remove() method as follows:
To remove everything after the first /
input = input.Remove(input.IndexOf("/") + 1);
To remove everything after the last /
input = input.Remove(input.LastIndexOf("/") + 1);
Here's another simple solution. The following code will return everything before the '|' character:
if (path.Contains('|'))
path = path.Split('|')[0];
In fact, you could have as many separators as you want, but assuming you only have one separation character, here is how you would get everything after the '|':
if (path.Contains('|'))
path = path.Split('|')[1];
(All I changed in the second piece of code was the index of the array.)
The Uri class is generally your best bet for manipulating Urls.
To remove everything before a specific char, use below.
string1 = string1.Substring(string1.IndexOf('$') + 1);
What this does is, takes everything before the $ char and removes it. Now if you want to remove the items after a character, just change the +1 to a -1 and you are set!
But for a URL, I would use the built in .NET class to take of that.
Request.QueryString helps you to get the parameters and values included within the URL
example
string http = "http://dave.com/customers.aspx?customername=dave"
string customername = Request.QueryString["customername"].ToString();
so the customername variable should be equal to dave
regards
I second Hightechrider: there is a specialized Url class already built for you.
I must also point out, however, that the PHP's replaceAll uses regular expressions for search pattern, which you can do in .NET as well - look at the RegEx class.
you can use .NET's built in method to remove the QueryString.
i.e., Request.QueryString.Remove["whatever"];
here whatever in the [ ] is name of the querystring which you want to
remove.
Try this...
I hope this will help.
You can use this extension method to remove query parameters (everything after the ?) in a string
public static string RemoveQueryParameters(this string str)
{
int index = str.IndexOf("?");
return index >= 0 ? str.Substring(0, index) : str;
}