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Capturing groups are numbered by counting the opening parentheses from left to right. To find out how many groups are present in the expression, call the groupCount() method on a matcher object. The groupCount() method returns an int showing the number of capturing groups present in the matcher’s pattern. package org.kodejava.example.regex; import java.util.regex.Matcher; import java.util.regex.Pattern; […]
This example show you how to attach quantifier to character classes or capturing group in regular expressions. package org.kodejava.example.regex; import java.util.regex.Pattern; import java.util.regex.Matcher; public class CombineWithQuantifier { public static void main(String[] args) { // [abc]{3} –> apply quantifier in character class. // Find 'a' or 'b' or 'c', three times in a row. // // […]
The reluctant quantifiers start the matcher at the beginning of the input string, then reluctantly eat one character at a time looking for a match. The last thing they try is the entire input string. package org.kodejava.regex; import java.util.regex.Matcher; import java.util.regex.Pattern; public class ReluctantQuantifierDemo { public static void main(String[] args) { String[] expressions = {"x??", […]
The possessive quantifiers always eat the entire input string, trying once (and only once) for a match. Unlike the greedy quantifiers, possessive quantifiers never back off, even if doing so would allow the overall match to succeed. package org.kodejava.regex; import java.util.regex.Matcher; import java.util.regex.Pattern; public class PossessiveQuantifierDemo { public static void main(String[] args) { String[] regexs […]
It’s also possible to enable various flags using embedded flag expressions. Embedded flag expressions are an alternative to the two-argument version of compile, and are specified in the regular expression itself. The example below is use (?i) flag expression to enable case-insensitive matching. Another flag expressions are listed below: (?x), equivalent with Pattern.COMMENTS (?m), equivalent […]
You can pause a current thread for a number of milliseconds by using the sleep() method of the Thread class. While the current thread is sleeping, it will allow other threads to execute. package org.kodejava.lang; public class ThreadSleepDemo implements Runnable { public static void main(String[] args) { Thread thread = new Thread(new ThreadSleepDemo()); thread.start(); } […]
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