Csharp/CSharp Tutorial/String/String Search
Содержание
Search a character in a string
<source lang="csharp">using System;
class MainClass {
public static void Main() {
string str = "abcdefghijk";
int idx;
Console.WriteLine("str: " + str);
idx = str.IndexOf("h");
Console.WriteLine("Index of first "h": " + idx);
}
}</source>
str: abcdefghijk Index of first "h": 7
Search a character in a string: lastindex
<source lang="csharp">using System;
class MainClass {
public static void Main() {
string str = "abcdefghijk";
int idx;
Console.WriteLine("str: " + str);
idx = str.LastIndexOf("h");
Console.WriteLine("Index of last "h": " + idx);
}
}</source>
str: abcdefghijk Index of last "h": 7
Search any characters in a string
<source lang="csharp">using System;
class MainClass {
public static void Main() {
string str = "abcdefghijk";
int idx;
char[] chrs = { "a", "b", "c" };
idx = str.IndexOfAny(chrs);
Console.WriteLine("Index of first "a", "b", or "c": " + idx);
}
}</source>
Index of first "a", "b", or "c": 0
Search a string from the start or from the end
<source lang="csharp">using System;
class MainClass {
public static void Main() {
string str1 = "ABCDEabcde1234567e890";
// search string
int idx = str1.IndexOf("e");
Console.WriteLine("Index of first occurrence of One: " + idx);
idx = str1.LastIndexOf("e");
Console.WriteLine("Index of last occurrence of One: " + idx);
}
}</source>
Index of first occurrence of One: 9 Index of last occurrence of One: 17
Search a sub string in a string
<source lang="csharp">using System;
class MainClass {
public static void Main() {
string str = "abcdefghijk";
int idx;
idx = str.IndexOf("def");
Console.WriteLine("Index of first \"def\": " + idx);
}
}</source>
Index of first "def": 3
Search a sub string in a string: lastIndexOf
<source lang="csharp">using System;
class MainClass {
public static void Main() {
string str = "abcdefghijk";
int idx;
idx = str.LastIndexOf("def");
Console.WriteLine("Index of last \"def\": " + idx);
}
}</source>
Index of last "def": 3
String starts with and ends with
<source lang="csharp">using System;
class MainClass {
public static void Main() {
string str = "abcdefghijk";
if(str.StartsWith("abc"))
Console.WriteLine("str begins with \"abc\"");
if(str.EndsWith("ijk"))
Console.WriteLine("str ends with \"ijk.\"");
}
}</source>
str begins with "abc" str ends with "ijk."
