一，java.util.regex包中提供了兩個類來表示對正則表達式的支持1.Matcher，通過解釋Pattern對character sequence 執行匹配操作的引擎public final class Matcher implements MatchResult2.Pattern，正則表達...
一，java.util.regex包中提供了兩個類來表示對正則表達式的支持
1.Matcher，通過解釋Pattern對character sequence 執行匹配操作的引擎
public final class Matcher implements MatchResult
2.Pattern，正則表達式的編譯表示形式
public final class Pattern implements java.io.Serializable
代碼：
package yuki.regular;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class FirstTest {
public static void main(String[] args) {
/**
* Pattern，正則表達式的編譯表示形式
* public final class Pattern implements java.io.Serializable
*/
String str = "hi! i am a tony; glad to see you!";
String regex = "\\p{Punct}";
Pattern pattern = Pattern.compile(regex);
String[] strArr = pattern.split(str);
for(int i = 0; i < strArr.length; ++i)
System.out.println("strArr[" + i + "] = " + strArr[i]);
/**
* Matcher，通過解釋Pattern對character sequence執行匹配操作
* public final class Matcher implements MatchResult
*/
Matcher matcher = pattern.matcher(str);
System.out.println(matcher.matches() ? "匹配" : "不匹配");
System.out.println(
Pattern.compile("\\p{Punct}+").matcher(".,.;").matches()
? "匹配" : "不匹配");
String s2 = "[email protected]";
Pattern p2 = Pattern.compile("\\w+@\\w+.[a-zA-Z]+");
Matcher m2 = p2.matcher(s2);
System.out.println("m2.matches() = " + m2.matches());
}
}
運行結果：
| 1 2 3 4 5 6 |
strArr[0] = hi
strArr[1] = i am a tony
strArr[2] = glad to see you
不匹配
匹配
m2.matches() = true
|
二，String類對正則的支持
代碼：
package yuki.regular;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class SecondTest {
public static void main(String[] args) {
/**
* 匹配替換
*/
String date = "2015/2/27";
Pattern p = Pattern.compile("/");
Matcher m = p.matcher(date);
String s = m.replaceAll("-");
System.out.println("m.matches() = " + m.matches());
System.out.println("s = " + s);
System.out.println("m.replaceFirst(\"-\") = " + m.replaceFirst("-"));
//匹配電話號碼
String phone = "0755-28792686";
String regex = "\\d{3,4}-\\d{7,8}";
boolean isPhone = phone.matches(regex);
System.out.println("isPhone = " + isPhone);
}
}
運行結果：
| 1 2 3 4 |
m.matches() = false
s = 2015-2-27
m.replaceFirst("-") = 2015-2/27
isPhone = true
|
三，常用示例
代碼：
package yuki.regular;
public class ThirdTest {
public static void main(String[] args) {
/**
* 至少含有字元串數組中的一個
*/
String s = "123,456,789,012,345";
String s2 = "123,456,789,013,345";
String regex = ".*(234|678|012).*";
boolean isMatch = s.matches(regex);
boolean isMatch2 = s2.matches(regex);
System.out.println("isMatch = " + isMatch);
System.out.println("isMatch2 = " + isMatch2);
//匹配金額
String price = "499.00";
System.out.println("price.matches(\"\\d+.\\d+\")" + price.matches("\\d+.\\d+"));
}
}
運行結果：
| 1 2 3 |
isMatch = true
isMatch2 = false
price.matches("\d+.\d+")true
|
