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Java Articles
Page 359 of 450
Pattern DOTALL field in Java with examples
The DOTALL field of the Pattern class Enables dotall mode. By default, the “.” Meta character in regular expressions matches all characters except line terminators.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class DOTALL_Example { public static void main( String args[] ) { String regex = "."; String input = "this is a sample this is second line"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); int count =0; while(matcher.find()) { count++; System.out.print(matcher.group()); ...
Read MorePattern COMMENTS field in Java with examples
The COMMENTS field of the Pattern class allows whitespace and comments in pattern. When you use this as flag value to the compile() method, white spaces and, comments starting with # are ignored in the given pattern.Example 1import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class COMMENTES_Example { public static void main( String args[] ) { Scanner sc = new Scanner(System.in); System.out.println("Enter input data: "); String input = sc.nextLine(); //Regular expression to find digits String regex = "\d #ignore this comment"; //Compiling ...
Read MorePattern CASE_INSENSITIVE field in Java with examples
This CASE_INSENSITIVE field of the Pattern class matches characters irrespective of case. When you use this as flag value to the compile() method and if you search for characters using regular expressions characters of both cases will be matched.Note − By default, this flag matches only ASCII charactersExample 1import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class CASE_INSENSITIVE_Example { public static void main( String args[] ) { Scanner sc = new Scanner(System.in); System.out.println("Enter input data: "); String input = sc.nextLine(); System.out.println("Enter required character: "); char ...
Read MorePattern splitAsStream() method in Java with examples
The Pattern class of the java.util.regex package is a compiled representation of a regular expression.The splitAsStream() method of this class accepts a CharSequence object, representing the input string as a parameter and, at each match, it splits the given string into a new substring and returns the result as a stream holding all the substrings.Exampleimport java.util.regex.Pattern; import java.util.stream.Stream; public class SplitAsStreamMethodExample { public static void main( String args[] ) { //Regular expression to find digits String regex = "(\s)(\d)(\s)"; String input = " 1 Name:Radha, age:25 2 Name:Ramu, age:32" + ...
Read MoreExplain the Java regular expression construct "re?".
The subexpression/metacharacter “re?” matches 0 or 1 occurrence of the preceding expression.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "Wel?"; String input = "Welcome to Tutorialspoint"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }OutputNumber of matches: 1Example 2Following Java program accepts a string from ...
Read MoreExplain the Sub-Expression "(?> re)" in Java Regular Expressions
The subexpression/metacharacter “(?> re)” matches the independent pattern without backtracking.Exampleimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class PatternExample { public static void main(String args[]) { //Reading String from user System.out.println("Enter a String"); Scanner sc = new Scanner(System.in); String input = sc.next(); String regex = "(?>[0-9])"; //Compiling the regular expression Pattern pattern = Pattern.compile(regex); //Retrieving the matcher object Matcher matcher = pattern.matcher(input); //verifying whether match occurred boolean ...
Read MoreSub-Expression "(?: re)" in Java Regular Expressions
The subexpression/metacharacter “(?: re)” groups regular expressions without remembering the matched text.Exampleimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class PatternExample { public static void main(String args[]) { //Reading String from user System.out.println("Enter a String"); Scanner sc = new Scanner(System.in); String input = sc.next(); String regex = "(?:[0-9])"; //Compiling the regular expression Pattern pattern = Pattern.compile(regex); //Retrieving the matcher object Matcher matcher = pattern.matcher(input); //verifying whether match occurred ...
Read MoreRegular Expression "(re)" Sub-Expression in Java
The subexpression/metacharacter “( )” groups the regular expressions and remembers the matched text.Example 1import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main( String args[] ) { String input = "Hello how are you welcome to Tutorialspoint"; String regex = "H(ell|ow)"; //Compiling the regular expression Pattern pattern = Pattern.compile(regex); //Retrieving the matcher object Matcher matcher = pattern.matcher(input); if(matcher.find()) { System.out.println("Match found"); } else { ...
Read MoreExplain the Metacharacter "B" in Java Regular Expressions.
The subexpression/metacharacter “\B” matches the non-word boundaries.Example 1import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "\Bcause"; Scanner sc = new Scanner(System.in); System.out.println("Enter a string: "); String input = sc.nextLine(); Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count ++; } System.out.println("Number of matches: "+count); } ...
Read MoreHow to match a character from given string including case using Java regex?
The java.util.regex package of java provides various classes to find particular patterns in character sequences. The pattern class of this package is a compiled representation of a regular expression.To match a specific character from the given input string −Get the input string.This compile() method of this class accepts a string value representing a regular expression and an integer value representing a flag returns a Pattern object. Compile the regular expression bypassing −The pattern matcher “[ ]” with required character in it ex: “[t]”.The flag CASE_INSENSITIVE to ignore case.The matcher() method of the Pattern class accepts an input string and returns ...
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