Click here to watch in Youtube :
https://www.youtube.com/watch?v=U2oY58LmjLc&list=UUhwKlOVR041tngjerWxVccw
StringMatcher.java
public class StringMatcher
{
/*
* returns true if the string contains of three letters
*/
public boolean isThreeLetters(String s)
{
return s.matches("[a-zA-Z]{3}");
}
/*
* returns true if the string does not have a number at the beginning
*/
public boolean isNoNumberAtBeginning(String s)
{
return s.matches("^[^\\d].*");
}
}
RegexDemo.java
Output
Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/RegexDemo_StringMatcher_threeLetters.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/RegexDemo_StringMatcher_threeLetters
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/ef02c9011c18b0aa670526ba89cc11f493b9b854/BasicJava/RegexDemo_StringMatcher_threeLetters/?at=master
See also:
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Kids Tutorial
https://www.youtube.com/watch?v=U2oY58LmjLc&list=UUhwKlOVR041tngjerWxVccw
StringMatcher.java
public class StringMatcher
{
/*
* returns true if the string contains of three letters
*/
public boolean isThreeLetters(String s)
{
return s.matches("[a-zA-Z]{3}");
}
/*
* returns true if the string does not have a number at the beginning
*/
public boolean isNoNumberAtBeginning(String s)
{
return s.matches("^[^\\d].*");
}
}
RegexDemo.java
public class RegexDemo
{
public static void main(String[] args)
{
StringMatcher stringMatcher = new StringMatcher();
System.out.println(stringMatcher.isThreeLetters("cat")); // true
System.out.println(stringMatcher.isThreeLetters("tiger")); // false
System.out.println("-----------------------------");
System.out.println(stringMatcher.isNoNumberAtBeginning("Hello")); // true
System.out.println(stringMatcher.isNoNumberAtBeginning("9Hello")); // false
}
}
{
public static void main(String[] args)
{
StringMatcher stringMatcher = new StringMatcher();
System.out.println(stringMatcher.isThreeLetters("cat")); // true
System.out.println(stringMatcher.isThreeLetters("tiger")); // false
System.out.println("-----------------------------");
System.out.println(stringMatcher.isNoNumberAtBeginning("Hello")); // true
System.out.println(stringMatcher.isNoNumberAtBeginning("9Hello")); // false
}
}
Output
true
false
-----------------------------
true
false
false
-----------------------------
true
false
Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/RegexDemo_StringMatcher_threeLetters.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/RegexDemo_StringMatcher_threeLetters
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/ef02c9011c18b0aa670526ba89cc11f493b9b854/BasicJava/RegexDemo_StringMatcher_threeLetters/?at=master
See also:
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