Regex Example in java

1. How to find words have uppercase
public class Example1 { public static void main(String[] args) { String msg="hello frIends how1 r U ?"; String t[]=msg.split(" "); for(int i=0;i<t.length;i++) { if(t[i].matches("(.*)([A-Z]+)(.*)")) { System.out.println(t[i]); } } } }
2. How to find words have number
public class Example2 { public static void main(String[] args) { String msg="1hello fr1ends how1 r ?"; String t[]=msg.split(" "); for(int i=0;i<t.length;i++) { if(t[i].matches("(.*)([0-9]+)(.*)")) { System.out.println(t[i]); } } } }
2. How to find words have special char
public class Example3 { public static void main(String[] args) { String msg="1hello fr1e%ds how1 r ?"; String t[]=msg.split(" "); for(int i=0;i<t.length;i++) { if(t[i].matches("(.*)([!@#$%^&*]+)(.*)")) { System.out.println(t[i]); } } } }
4. How to split string from multiple white space
public class Example4 { public static void main(String[] args) { String msg="hello friends how r u ?"; String t[]=msg.split("\\s+"); for(int i=0;i<t.length;i++) { System.out.println(t[i]); } } }
5. How to find vowels from given string
public class Example5 { public static void main(String[] args) { String msg="hello friends how r u ?"; String s=msg.replaceAll("[BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz]",""); System.out.println(s); } }
6. Password pattern, Email Pattern, White Space Pattern, Mobile Pattern, Digit with Letter pattern example
import java.util.regex.Matcher; import java.util.regex.Pattern; public class Regex { String emailPattern="^[a-zA-Z0-9]{1,20}@[a-zA-Z]{1,20}.[a-zA-Z]{2,3}$"; String mobilePattern="\\d{10}"; String fullName="^[a-zA-Z\\s]+"; String passwordPattern="((?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[!?&()@$%#]).{6,15})"; String dwl="(.*)(\\d+)(.*)"; public boolean digitwithletter(String data){ Pattern p=Pattern.compile(dwl); Matcher m=p.matcher(data); if(m.find()){ //System.out.println(m.group()); return true; }else{ return false; } } public boolean emailValidation(String email){ Pattern pattern=Pattern.compile(emailPattern); Matcher matcher=pattern.matcher(email); if(!matcher.matches()){ return false; }else{ return true; } } public void printNamesWithOutSpaces(String names){ String data[]=names.split("\\s+"); for(String n:data){ System.out.println(n); } } public boolean mobileNumber(String mobile){ Pattern pattern=Pattern.compile(mobilePattern); Matcher matcher=pattern.matcher(mobile); if(!matcher.matches()){ return false; }else{ return true; } } public boolean fullName(String name){ Pattern pattern=Pattern.compile(fullName); Matcher matcher=pattern.matcher(name); if(!matcher.matches()){ return false; }else{ return true; } } public boolean passwordValidation(String password){ Pattern pattern=Pattern.compile(passwordPattern); Matcher matcher=pattern.matcher(password); if(!matcher.matches()){ return false; }else{ return true; } } public static void main(String[] args) { Regex r=new Regex(); //System.out.println(r.digitwithletter("deep1"));; //System.out.println(r.emailValidation("deep44@gmail.com")); //r.printNamesWithOutSpaces("my name is deep "); //System.out.println(r.mobileNumber("8224898008")); //System.out.println(r.fullName("Deep singh")); System.out.println(r.passwordValidation("eWp$d1h")); } }