Java replaceFirst and replaceAll methods, replacefirst

Java replaceFirst and replaceAll methods, replacefirst

ReplaceFirst and replaceAll are used to replace the text that matches the regular expression. The difference is that replaceFirst replaces the first match, and replaceAll replaces all matches.

The following example illustrates this function:

Import java. util. regex. matcher; import java. util. regex. pattern; public class RegexMatches {private static String REGEX = "dog"; private static String INPUT = "The dog says meow. "+" All dogs say meow. "; private static String REPLACE =" cat "; public static void main (String [] args) {Pattern p = Pattern. compile (REGEX); // get a matcher object Matcher m = p. matcher (INPUT); INPUT = m. replaceAll (REPLACE); System. out. println (INPUT );}}

The above example compilation and running results are as follows:

The cat says meow. All cats say meow.