How to Check for Consecutive Letters in Java

As part of its standard class library, Java includes methods for determining whether a sequence of characters, or a "pattern," is matched by any portion of a given string of characters. In particular, a pattern can test whether several letters appear in sequence within the string; for example, "gon" matches "trigonometry." You can write Java code that checks for the presence of several consecutive letters within a string.

Instructions

1. Include the following lines at the beginning of your Java code:

   import java.util.regex.Pattern;

   import java.util.regex.Matcher;

2. Create an instance of class Pattern for the letters you want to test for, as in the following sample code:

   Pattern myPattern = Pattern.compile("gon");

   Replace "gon" with the sequence of any number of consecutive letters you want to test for.

3. Create an instance of class Matcher, as in the following sample code:

   Matcher myMatcher = myPattern.matcher("trigonometry");

   Replace "trigonometry" with the string where you want to perform the search.

4. Test if the string contains a match for the pattern, as in the following sample code:

   if (myMatcher.find()) {

   System.out.println("There was a match");

   } else {

   System.out.println("There was no match");

   }

References

• Oracle: Java: Class Matcher