This might sound like a very basic question, but it's one that's given me quite a lot of trouble in C#
.
Assume I have, for example, the following String
s known as my chosenTarget.title
s:
2008/SD128934 - Wordz aaaaand more words (1233-26-21)
20998/AD1234 - Wordz and less words (1263-21-21)
208/ASD12345 - Wordz and more words (1833-21-21)
Now as you can see, all three String
s are different in some ways.
What I need is to extract a very specific part of these String
s, but getting the subtleties right is what confuses me, and I was wondering if some of you knew better than I.
What I know is that the String
s will always come in the following pattern:
yearNumber + "/" + aFewLetters + theDesiredNumber + " - " + descriptiveText + " (" + someDate + ")"
In the above example, what I would want to return to me would be:
128934
1234
12345
I need to extract theDesiredNumber
.
Now, I'm not (that) lazy so I have made a few attempts myself:
var a = chosenTarget.title.Substring(chosenTarget.title.IndexOf("/") + 1, chosenTarget.title.Length - chosenTarget.title.IndexOf("/"));
What this has done is sliced out yearNumber
and the /
, leaving me with aFewLetter
before theDesiredNumber
.
I have a hard time properly removing the rest however, and I was wondering if any of you could aid me in the matter?
It sounds as if you only need to extract the number behind the first /
which ends at -
. You could use a combination of string methods and LINQ:
int startIndex = str.IndexOf("/");
string number = null;
if (startIndex >= 0 )
{
int endIndex = str.IndexOf(" - ", startIndex);
if (endIndex >= 0)
{
startIndex++;
string token = str.Substring(startIndex, endIndex - startIndex); // SD128934
number = String.Concat(token.Where(char.IsDigit)); // 128934
}
}
Another mainly LINQ approach using String.Split
:
number = String.Concat(
str.Split(new[] { " - " }, StringSplitOptions.None)[0]
.Split('/')
.Last()
.Where(char.IsDigit));
Try this:
int indexSlash = chosenTarget.title.IndexOf("/");
int indexDash = chosenTarget.title.IndexOf("-");
string out = new string(chosenTarget.title.Substring(indexSlash,indexDash-indexSlash).Where(c => Char.IsDigit(c)).ToArray());
You can use a regex:
var pattern = "(?:[0-9]+/\w+)[0-9]";
var matcher = new Regex(pattern);
var result = matcher.Matches(yourEntireSetOfLinesInAString);
Or you can loop every line and use Match instead of Matches. In this case you don't need to build a "matcher" in every iteration but build it outside the loop
Regex is your friend:
(new [] {"2008/SD128934 - Wordz aaaaand more words (1233-26-21)",
"20998/AD1234 - Wordz and less words (1263-21-21)",
"208/ASD12345 - Wordz and more words (1833-21-21)"})
.Select(x => new Regex(@"\d+/[A-Z]+(\d+)").Match(x).Groups[1].Value)
The pattern you had recognized is very important, here is the solution:
const string pattern = @"\d+\/[a-zA-Z]+(\d+).*$";
string s1 = @"2008/SD128934 - Wordz aaaaand more words(1233-26-21)";
string s2 = @"20998/AD1234 - Wordz and less words(1263-21-21)";
string s3 = @"208/ASD12345 - Wordz and more words(1833-21-21)";
var strings = new List<string> { s1, s2, s3 };
var desiredNumber = string.Empty;
foreach (var s in strings)
{
var match = Regex.Match(s, pattern);
if (match.Success)
{
desiredNumber = match.Groups[1].Value;
}
}
I would use a RegEx for this, the string you're looking for is in Match.Groups[1]
string composite = "2008/SD128934 - Wordz aaaaand more words (1233-26-21)";
Match m= Regex.Match(composite,@"^\d{4}\/[a-zA-Z]+(\d+)");
if (m.Success) Console.WriteLine(m.Groups[1]);
The breakdown of the RegEx is as follows
"^\d{4}\/[a-zA-Z]+(\d+)"
^ - Indicates that it's the beginning of the string
\d{4} - Four digits
\/ - /
[a-zA-Z]+ - More than one letters
(\d+) - More than one digits (the parenthesis indicate that this part is captured as a group - in this case group 1)
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.