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java 正则求解，100分在线急盼!!!

littleboys 2008-04-19 05:56:51

问题是这样的：

现在的有一个字符串，以逗号分割的2位或者1 位数字
例如：
values="1,12,16,56"

输入一个1 到2 位的数字字符，判断是否在存在于上面的字符中
只有 1 12 16 56 这4个数字符合条件，其它的都不符合。

怎样写这样的一个正则表达式？

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goodmrning 2008-04-22

学习了

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&永无止境 2008-04-22

Pattern p = Pattern.compile("1|12|16|56");
String input = "16";
System.out.println(p.matcher(input).matches());
input = "1";
System.out.println(p.matcher(input).matches());
input = "12";
System.out.println(p.matcher(input).matches());
input = "56";
System.out.println(p.matcher(input).matches());

input = "1156";
System.out.println(p.matcher(input).matches());
input = "5";
System.out.println(p.matcher(input).matches());
input = "11";
System.out.println(p.matcher(input).matches());
input = "26";
System.out.println(p.matcher(input).matches());
input = "121";
System.out.println(p.matcher(input).matches());
input = "55";
System.out.println(p.matcher(input).matches());
输出:
true
true
true
true
false
false
false
false
false
false

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puppyli 2008-04-22

学习学习

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puppyli 2008-04-22

学习，学习啊

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KKK2007 2008-04-22

[Quote=引用 19 楼 littleboys 的回复:]
上面的代码怎么乱了，再贴一次
Java codepublicclassCheckIn {/***@paramargs*/publicstaticvoidmain(String[] args) {

String type_id="1,2,9,13,17,14,56";
System.out.println("return1="+CheckIn.isIn(type_id,"1"));
System.out.println("return2="+CheckIn.isIn(type_id,"2"));
System.out.println("return3="+CheckIn.isIn(type_id,"3"));

System.out.println("retur…
[/Quote]

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我是风 2008-04-22

import java.util.Scanner;

public final class InputNumberTester {
private static String values = "1,12,16,56";

public static boolean Test(String numberStr) {
try {
Integer.parseInt(numberStr);
return InputNumberTester.values.contains(numberStr);
} catch (Exception e) {
return false;
}
}

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String inputString = "";
while(!inputString.equalsIgnoreCase("quit")) {
inputString = scanner.next();
System.out.println(InputNumberTester.Test(inputString));
}
}
}

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cyj18 2008-04-22

正则不是很清楚..但是用代码实现是OK的.

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cyj18 2008-04-22

给我分....我要分...

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cyj18 2008-04-22

import java.util.regex.Pattern;

public class Test
{
public static void main(String[] args)
{
String old = "1,12,16,56";
String value = "21";
System.out.println(checked(value, old));

}

public static boolean checked(String str,String old)
{
if(str.indexOf(',')== -1)
{
Pattern pa = Pattern.compile(str);
return pa.matcher(old).find();
}
return false;
}
}

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gzdiablo 2008-04-22

不好意思发现java下正则表达式的方法和.net有点不同下面是indexOf的方法

boolean xxx(String str,String aa){

    return ("," + str + ",").indexOf("," + aa + ",") > -1;

}

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tombow 2008-04-22

没必要用正则啊．

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littleboys 2008-04-22

50 楼了，谢谢大家的关注，我把帖子又加了100 分，散散分。

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haoxiongok 2008-04-22

我来帮楼主顶上去

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littleboys 2008-04-22

看来也没有新的方法了。
总结一下：



//12,23，38，53 楼

boolean check1(String str,String input){

    return ("," + str + ",").indexOf("," + input+ ",") > -1;

}

//11 楼

boolean check2(String str,String input){

    return str.matches(".*\\"+input+"\\b.*"));

}

//24，27 ... 

boolean check3(String str,String input){

    return input.matches(str.replaceAll(",","|"));

}

总体感觉这三个方法比较好
正向(24)、逆向思维(11楼)都有

总结完毕

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&永无止境 2008-04-22

如果需要,可以再加些对str,input的验证
public class CheckIn {

/**
* @param args
*/
public static void main(String[] args) {

String type_id ="1,2,9,13,17,14,56";
System.out.println("return 1="+CheckIn.isIn(type_id,"1"));
System.out.println("return 2="+CheckIn.isIn(type_id,"2"));
System.out.println("return 3="+CheckIn.isIn(type_id,"3"));

System.out.println("return 4="+CheckIn.isIn(type_id,"4"));
System.out.println("return 13="+CheckIn.isIn(type_id,"13"));
System.out.println("return 5="+CheckIn.isIn(type_id,"5"));
System.out.println("return 6="+CheckIn.isIn(type_id,"6"));

System.out.println("return 11 1="+CheckIn.isIn("11","1"));
System.out.println("return 1 11="+CheckIn.isIn("1,11","11"));
System.out.println("return 55 58="+CheckIn.isIn("55,58","4"));
System.out.println("return ,58="+CheckIn.isIn(",58","58"));
System.out.println("return , 58="+CheckIn.isIn(" , 58","58"));
System.out.println("return q,58="+CheckIn.isIn("q,58","58"));
System.out.println("return 5,58="+CheckIn.isIn("5,58","5"));
System.out.println("return 5,58="+CheckIn.isIn("5,58","f11"));
System.out.println("return ,5,8,="+CheckIn.isIn(",5,8,","8"));

}

public static boolean isIn(String str,String input)
{
//如果需要，加上str和input的验证
String reg_str = "((\\d{1,2})?,?)+";
String reg_input = "\\d+";
System.out.print("str(" + str + ") is Ok?" + str.matches(reg_str) + "; input(" + input + ") is ok?" + input.matches(reg_input) + " ");
if (!str.matches(reg_str)) {
return false;
}
if (!input.matches(reg_input)) {
return false;
}
String newStr = str.replaceAll(",", "|");
return input.matches(newStr);
}

}
输出:
str(1,2,9,13,17,14,56) is Ok?true; input(1) is ok?true return 1=true
str(1,2,9,13,17,14,56) is Ok?true; input(2) is ok?true return 2=true
str(1,2,9,13,17,14,56) is Ok?true; input(3) is ok?true return 3=false
str(1,2,9,13,17,14,56) is Ok?true; input(4) is ok?true return 4=false
str(1,2,9,13,17,14,56) is Ok?true; input(13) is ok?true return 13=true
str(1,2,9,13,17,14,56) is Ok?true; input(5) is ok?true return 5=false
str(1,2,9,13,17,14,56) is Ok?true; input(6) is ok?true return 6=false
str(11) is Ok?true; input(1) is ok?true return 11 1=false
str(1,11) is Ok?true; input(11) is ok?true return 1 11=true
str(55,58) is Ok?true; input(4) is ok?true return 55 58=false
str(,58) is Ok?true; input(58) is ok?true return ,58=true
str( , 58) is Ok?false; input(58) is ok?true return , 58=false
str(q,58) is Ok?false; input(58) is ok?true return q,58=false
str(5,58) is Ok?true; input(5) is ok?true return 5,58=true
str(5,58) is Ok?true; input(f11) is ok?false return 5,58=false
str(,5,8,) is Ok?true; input(8) is ok?true return ,5,8,=true

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&永无止境 2008-04-22

24的不应该加[],加了[]他认为[]里的是一为数字,就与题目本意差远了,还是发个我的版本吧
public class CheckIn {

/**
* @param args
*/
public static void main(String[] args) {

String type_id ="1,2,9,13,17,14,56";
System.out.println("return 1="+CheckIn.isIn(type_id,"1"));
System.out.println("return 2="+CheckIn.isIn(type_id,"2"));
System.out.println("return 3="+CheckIn.isIn(type_id,"3"));

System.out.println("return 4="+CheckIn.isIn(type_id,"4"));
System.out.println("return 13="+CheckIn.isIn(type_id,"13"));
System.out.println("return 5="+CheckIn.isIn(type_id,"5"));
System.out.println("return 6="+CheckIn.isIn(type_id,"6"));

System.out.println("return 11 1="+CheckIn.isIn("11","1"));
System.out.println("return 1 11="+CheckIn.isIn("1","11"));
System.out.println("return 55 58="+CheckIn.isIn("55,58","4"));

}

public static boolean isIn(String str,String input)
{
String newStr = str.replaceAll(",", "|");
return input.matches(newStr);
}

}

输出:
return 1=true
return 2=true
return 3=false
return 4=false
return 13=true
return 5=false
return 6=false
return 11 1=false
return 1 11=false
return 55 58=false

不知道楼主要的是不是这个效果?

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&永无止境 2008-04-22

哦,前面没理解楼主的意思,下面改进如下:
哎呀,已经有人写出来了,直接用24楼的就行了

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classnameextendsjava 2008-04-21

[Quote=引用 42 楼 gzdiablo 的回复:]
LS还须努力最好别抄11楼的 11楼的还不算很好只是比其它人都强些

其实按照lz的要求下面就行了

JScript codeboolean xxx(String str,String aa){
return str.matches("\\b" + aa + "\\b");
}
[/Quote]
当然是没看他的了要不然也不会用那么撮的表达式了
return str.matches(".*\\b" + aa + "\\b.*");

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gjgj3368 2008-04-21

学习

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wuyetingyu 2008-04-21

[Quote=引用 42 楼 gzdiablo 的回复:]
LS还须努力最好别抄11楼的 11楼的还不算很好只是比其它人都强些

其实按照lz的要求下面就行了

JScript codeboolean xxx(String str,String aa){
return str.matches("\\b" + aa + "\\b");
}
[/Quote]
能讲详细一点吗，把测试的部分写完，偶很菜的

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java 正则求解，100分 在线急盼!!!

java 正则求解，100分在线急盼!!!