Java Regular Expressions filter letters, numbers, and Chinese-regular expressions

1, Java filter out letters, numbers and Chinese regular expressions

(1) filter out the regular expression of the letter

[^ (a-za-z)]

(2) Regular expressions that filter out numbers

[^ (0-9)]

(3) Filtering out regular expressions in Chinese

[^ (\\U4E00-\\U9FA5)]

(4) Regular expressions that filter out letters, numbers, and Chinese

[^ (A-ZA-Z0-9\\U4E00-\\U9FA5)]

2. Example source code

* * @Title: Filterstr.java * @Package: Com.you.dao * @Description: Filtering numbers, letters and Chinese in Java @Author: Zhanghaidong * @date: March 12, 2014

Afternoon 7:18:20 * @Version V1.2.3 * * Package Com.you.dao; /** * @ class Name: Filterstr * @ Description: Regular expression filter numbers, letters and Chinese * @Author: Zhanghaidong * @date: March 12, 2014 PM 7:18:20/public class Filterstr {/ 
 * * * @Title: Filternumber * @Type: Filterstr * @date: March 12, 2014 afternoon 7:23:03 * @Description: Filter out numbers * @param str
 * @return */public static string Filternumber (string number) {Number = Number.replaceall ("[^ (0-9)]", "");
 return number; /** * * @Title: Filteralphabet * @Type: Filterstr * @date: March 12, 2014 afternoon 7:28:54 * @Description: Filter out letters * @p
 Aram Alph * @return/public static string Filteralphabet (String alph) {Alph = Alph.replaceall ("[^ (a-za-z)]", "");
 return Alph; /** * * @Title: Filterchinese * @Type: Filterstr * @date: March 12, 2014 afternoon 9:12:37 * @Description: Filter out Chinese * @pa Ram Chin * @return/public static string Filterchinese (stringChin) {chin = Chin.replaceall ("[^ (\\U4E00-\\U9FA5)]", "");
 return chin; /** * * @Title: Filter * @Type: FILTERSTR * @date: March 12, 2014 afternoon 9:17:22 * @Description: Filter out letters, numbers and Chinese * @par AM character * @return * */public static String filter (String character) {character = Character.replaceall ("[^ (a-za-z
 0-9\\U4E00-\\U9FA5)] "", "");
 return character; /** * @Title: Main * @Type: FILTERSTR * @date: March 12, 2014 afternoon 7:18:22 * @Description: * @param args * * Publ
 IC static void Main (string[] args) {/** * declaration string you/String you = "^&^&^you123$%$% Hello";
 /** * Call to filter out the number of methods * * you = Filternumber (for you);
 
 /** * Print Results/System.out.println ("filter out the number:" + you); /** * Declaration string hai/String hai = "￥% ...
 4556ahihdjsadhj$%$%, how are you, Wewewe? "
 /** * Call the method of filtering out the letter * * hai = Filteralphabet (hai);
 
 /** * Print Result * * SYSTEM.OUT.PRINTLN ("filter out the letter:" + hai);
 /** * Declaration string dong/String dong = "$%$%$ John 34584yuojk Dick @#￥#%%￥......%&"; /** * Call to filter out the Chinese method * * dong = fIlterchinese (Dong);
 
 /** * Print Results * * SYSTEM.OUT.PRINTLN ("Filtered out Chinese:" + dong);
 /** * Declaration string str/String str = "$%$%$ John 34584yuojk Dick @#￥#%%￥......%&";
 /** * Calls to filter out letters, numbers, and Chinese methods/str = filter (str);
 
 /** * Print Results/System.out.println ("filter out letters, numbers and Chinese:" + str);

 }

}

3, the results of the operation of the instance

Filtered out Number: 123
Filter out letters: Ahihdjsadhjwewewe
Filter out Chinese: dick
Filter out letters, numbers and Chinese: John 34584yuojk Dick

Ps:java Regular expression Filter Chinese characters

String str = "Hello how are you, I'm good thank you"; 
String reg = "[\u2e80-\u9fff]"; 
Pattern Pat = Pattern.compile (reg); 
Matcher mat = Pat.matcher (str); 
String repickstr = Mat.replaceall ("");
System.out.println ("After filtering Chinese:" +repickstr);
Demo:import Java.util.regex.Matcher;
Import Java.util.regex.Pattern; public class T {/** * filter letter * @param alphabet * @return/public static string Filteralphabet (String alphabet) {RE
 Turn Alphabet.replaceall ("[A-za-z]", ""); /** * Filter Number * @param digital * @return/public static string Filterdigital (String digital) {return DIGITAL.REPLA
 Ceall ("[0-9]", ""); /** * Filter Kanji * @param chin * @return/public static string Filterchinese (String chin) {return chin.replaceall ("[\
 \U4E00-\\U9FA5] "," ""); /** * Filter letters, numbers, Kanji * @param character * @return/public static String Filterall (String character) {return Charac
 Ter.replaceall ("[A-za-z0-9\\u4e00-\\u9fa5]", ""); }/** * @param args */public static void main (string[] args) {//TODO Auto-generated method stub String str = "Hello how are you, I'm good thank you"; 
 String reg = "[\u2e80-\u9fff]"; 
 Pattern Pat = Pattern.compile (reg); 
 Matcher mat = Pat.matcher (str); 
 String repickstr = Mat.replaceall (""); 
 System.out.println ("After filtering Chinese:" +repickstr);
 System.out.println ("-----------------");
 System.out.println (Filteralphabet ("123abc hello"));
 System.out.println (filterdigital ("123abc hello"));
 System.out.println (Filterchinese ("123abc hello"));
 System.out.println (Filterall ("123abc hello")); }
}

The above is about Java regular Expressions filter Chinese, letters, numbers, all the narration, I hope you like.