I am new to programming languages. I have a requirement where I have to return a record based on a search string.
For example, take the following three records and a search string of "Cal":
University of California
Pascal Institute
California University
I've tried String.Contains
, but all three are returned. If I use String.StartsWith
, I get only record #3. My requirement is to return #1 and #3 in the result.
Thank you for your help.
If you're using .NET 3.5 or higher, I'd recommend using the LINQ extension methods . Check out String.Split
and Enumerable.Any
. Something like:
string myString = "University of California";
bool included = myString.Split(' ').Any(w => w.StartsWith("Cal"));
Split
divides myString
at the space characters and returns an array of strings. Any
works on the array, returning true if any of the strings starts with "Cal"
.
If you don't want to or can't use Any
, then you'll have to manually loop through the words.
string myString = "University of California";
bool included = false;
foreach (string word in myString.Split(' '))
{
if (word.StartsWith("Cal"))
{
included = true;
break;
}
}
You can try:
foreach(var str in stringInQuestion.Split(' '))
{
if(str.StartsWith("Cal"))
{
//do something
}
}
I like this for simplicity:
if(str.StartsWith("Cal") || str.Contains(" Cal")){
//do something
}
You can use Regular expressions to find the matches. Here is an example
//array of strings to check
String[] strs = {"University of California", "Pascal Institute", "California University"};
//create the regular expression to look for
Regex regex = new Regex(@"Cal\w*");
//create a list to hold the matches
List<String> myMatches = new List<String>();
//loop through the strings
foreach (String s in strs)
{ //check for a match
if (regex.Match(s).Success)
{ //add to the list
myMatches.Add(s);
}
}
//loop through the list and present the matches one at a time in a message box
foreach (String matchItem in myMatches)
{
MessageBox.Show(matchItem + " was a match");
}
string univOfCal = "University of California";
string pascalInst = "Pascal Institute";
string calUniv = "California University";
string[] arrayofStrings = new string[]
{
univOfCal, pascalInst, calUniv
};
string wordToMatch = "Cal";
foreach (string i in arrayofStrings)
{
if (i.Contains(wordToMatch)){
Console.Write(i + "\n");
}
}
Console.ReadLine();
}
var strings = new List<string> { "University of California", "Pascal Institute", "California University" };
var matches = strings.Where(s => s.Split(' ').Any(x => x.StartsWith("Cal")));
foreach (var match in matches)
{
Console.WriteLine(match);
}
Output:
University of California
California University
This is actually a good use case for regular expressions.
string[] words =
{
"University of California",
"Pascal Institute",
"California University"
}
var expr = @"\bcal";
var opts = RegexOptions.IgnoreCase;
var matches = words.Where(x =>
Regex.IsMatch(x, expr, opts)).ToArray();
The "\\b" matches any word boundary (punctuation, space, etc...).
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.