Android Studio-Interception of several commonly used strings in the 42nd issue

String str= "123abc456";

int i=3;

1 Take the first I character of a string

Str=str. Substring (0,i); or STR=STR. Remove (i,str. LENGTH-I);

2 Remove the first I character of a string:

Str=str.  Remove (0,i); or STR=STR. Substring (i);

3 Take I characters starting from the right:

Str=str. Substring (str. LENGTH-I); or STR=STR. Remove (0,str. LENGTH-I);

4 Remove the I characters starting from the right:

Str=str. Substring (0,str. LENGTH-I); or STR=STR. Remove (str. Length-i,i);

5 Determine if there is "ABC" in the string and remove it

Using System.Text.RegularExpressions;

String str = "123abc456";

String a= "abc";

Regex r = new Regex (a);

Match m = r.match (str);

if (m.success)

{

The green part and the purple part take one kind.

Str=str. Replace (A, "");

Response.Write (str);

String str1,str2;

Str1=str. Substring (0,m.index);

Str2=str. Substring (m.index+a.length,str. Length-a.length-m.index);

Response.Write (STR1+STR2);

}

6 If there is "ABC" in the string, replace it with "ABC"

Str=str. Replace ("abc", "abc");

7. How to intercept the characters in front of the specified characters and the following characters in the string

String str = "Key:value:other";

string[] STRs = Str.split (":");

key = Strs[0];

Value = Strs[1];

other = strs[2];

************************************************

String str= "Adcdef"; int indexstart = str. IndexOf ("D");

int EndIndex =str. IndexOf ("E");

string tostr = str. SubString (Indexstart,endindex-indexstart);

C # intercepts the question of the last character of a string!

Str1. Substring (str1. LastIndexOf (",") +1)

This article is from the "Liangxiao Technology Center" blog, please be sure to keep this source http://liangxiao.blog.51cto.com/3626612/1949055

Android Studio-Interception of several commonly used strings in the 42nd issue