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Articles by Arnab Chakraborty
Page 3 of 3
Java regex to exclude a specific String constant
In this program, we will use a regular expression to check if a given string does not contain the substring "kk" using Java. The regular expression ^((?!kk).)*$ is designed to match strings that do not include the "kk" pattern anywhere in the string. The program will evaluate a sample string and print whether or not it contains "kk". Problem Statement Write a program in Java for checking whether a given string contains the substring "kk." If the string does not contain "kk" the program will return true otherwise it will return false. Input String s = "tutorials" Output true ...
Read MoreHow to test if a Java String contains a case insensitive regex pattern
the syntax? i:x makes the string search case-insensitive. for egpublic class RegCaseSense { public static void main(String[] args) { String stringSearch = "HI we are at java class."; // this won't work because the pattern is in upper-case System.out.println("Try this 1: " + stringSearch.matches(".*CLASS.*")); // the magic (?i:X) syntax makes this search case-insensitive, so it returns true System.out.println("Try this 2: " + stringSearch.matches("(?i:.*CLASS.*)")); } }
Read MoreMatch all occurrences of a regex in Java
public class RegexOccur { public static void main(String args[]) { String str = "java is fun so learn java"; String findStr = "java"; int lastIndex = 0; int count = 0; while(lastIndex != -1) { lastIndex = str.indexOf(findStr,lastIndex); if(lastIndex != -1) { count ++; lastIndex += findStr.length(); } } System.out.println(count); } }Output2
Read MoreHow do I use jQuery effects?
For hiding and showing the div, you can use hide and show method.For hiding$('#id1').hide();For showing$('#id1').show();Example showhide $(document).ready(function () { $('#btn1').click(function () { $('#id1').hide(); }); $('#btn2').click(function () { $('#id1').show(); }); }); I Am A Simple Paragraph Hide Show MethodDescriptionanimate()Runs a custom animation on the selected elementsclearQueue()Removes all remaining queued functions ...
Read MoreWhy we should use whole string in Java regular expression
In Java regex matches() matches the input string against the whole string as it add a ^ and $ at the end of the input string.so it will not match the substring. So for matching substring, you should use find().Exampleimport java.util.regex.*; class PatternMatchingExample { public static void main(String args[]) { String content = "aabbcc"; String string = "aa"; Pattern p = Pattern.compile(string); Matcher m = p.matcher(content); System.out.println(" 'aa' Match:"+ m.matches()); System.out.println(" 'aa' Match:"+ m.find()); } }Output'aa' Match:false 'aa' Match:true
Read MoreHow to extract a group from a Java String that contains a Regex pattern
How to extract a group from a Java String that contains a Regex patternimport java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexTest { public static void main(String[] args) { Pattern pattern = Pattern.compile("fun"); Matcher matcher = pattern.matcher("Java is fun"); // using Matcher find(), group(), start() and end() methods while (matcher.find()) { System.out.println("Found the text "" + matcher.group() + "" starting at " + matcher.start() + " index and ending at index ...
Read MoreHow to capture multiple matches in the same line in Java regex
Exampleimport java.util.regex.*; class PatternMatcher { public static void main(String args[]) { int count = 0; // String to be scanned to find the pattern. String content = "aaa bb aaa"; String string = "aaa"; // Create a Pattern object Pattern p = Pattern.compile(string); // get a matcher object Matcher m = p.matcher(content); while(m.find()) { count++; System.out.println("Match no:"+count); ...
Read MoreJava Regular Expression that doesn't contain a certain String.
Exampleimport java.util.regex.*; class PatternMatch{ public static void main(String args[]) { String content = "I am a student"; String string = ".*boy.*"; boolean isMatch = Pattern.matches(string, content); System.out.println("The line contains 'boy'?"+ isMatch); } }Outputthe line contains 'boy'?falsematches()It is used to check if the whole text matches a pattern. Its output is boolean. It returns true if match is found otherwise false.This is one of simplest and easiest way of searching a String in a text using Regex .There is a another method compile() , if you want ...
Read MoreHow to use R in Java-8 regex.
\R matches any line break as defined by the Unicode standardPattern p = Pattern.compile("\R");Unicode line-break sequence is equivalent to \u000D\u000A|[\u000A\u000B\u000C\u000D\u0085\u2028\u2029]
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