What is the Pattern class?

Pattern is a final class present in the java.util.regex package. It is used to define and hold regular expressions. This class works with the Matcher class to perform the match operations.

The Pattern class defines no public constructors. To create a pattern, a static method compile is used as follows:

static Pattern compile(String pattern): This static method compiles the given regular expression into a pattern.

The other important methods of the Pattern class are as follows:

• static Pattern compile(String regex, int flags)

  This static method compiles the given regular expression into a pattern with the given flags.

• public Matcher matcher(CharSequence input)
  This method creates a matcher that will match the given input against this pattern. It takes the character sequence to be matched and returns a matcher for the pattern.
• static boolean matches(String regex, CharSequence input)
  This static method compiles the given regular expression and attempts to match the given input against it.
• public String pattern()
  This method returns a String that represents the regular expression from which this pattern was compiled.

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