Click here to watch in Youtube :
https://www.youtube.com/watch?v=poHWl0h97tM&list=UUhwKlOVR041tngjerWxVccw
Click the below Image to Enlarge
How to use any character, digit and non-digit Regex meta-characters | Java Regex |
import java.util.regex.Pattern; /** * * \d = Any digits, short of [0-9] * */ public class RegexDemo1 { public static void main(String[] args) { System.out.println("metacharacters d"); /* * Parameters: * * regex - The expression to be compiled * * input - The character sequence to be matched * * Returns: * * whether or not the regular expression matches on the input * */ System.out.println(Pattern.matches("\\d", "9"));//true (digit and comes once) System.out.println(Pattern.matches("\\d", "dfg"));//false (non-digit) System.out.println(Pattern.matches("\\d", "8888"));//false (digit but comes more than once) System.out.println(Pattern.matches("\\d", "555abc"));//false (digit and char) System.out.println("----------------------------------"); System.out.println("metacharacters d with quantifier...."); System.out.println(Pattern.matches("\\d*", "56565"));//true (digit may come 0 or more times) } }Output
metacharacters d true false false false ---------------------------------- metacharacters d with quantifier.... trueRegexDemo2.java
import java.util.regex.Pattern; /** * * \D = Any non-digit, short for [^0-9] * */ public class RegexDemo2 { public static void main(String[] args) { System.out.println("metacharacters D.."); /* * Parameters: * * regex - The expression to be compiled * * input - The character sequence to be matched * * Returns: * * whether or not the regular expression matches on the input * */ System.out.println(Pattern.matches("\\D", "m"));//true (non-digit and comes once) System.out.println(Pattern.matches("\\D", "xds"));//false (non-digit but comes more than once) System.out.println(Pattern.matches("\\D", "1"));//false (digit) System.out.println(Pattern.matches("\\D", "8989"));//false (digit) System.out.println(Pattern.matches("\\D", "121abc"));//false (digit and char) System.out.println("----------------------------------"); System.out.println("metacharacters D with quantifier...."); System.out.println(Pattern.matches("\\D*", "peter"));//true (non-digit and may come 0 or more times) } }Output
metacharacters D.. true false false false false ---------------------------------- metacharacters D with quantifier.... trueRegexDemo3.java
import java.util.regex.Pattern; /** * * . = Any character (may or may not match terminator) * */ public class RegexDemo3 { public static void main(String[] args) { /* * Parameters: * * regex - The expression to be compiled * * input - The character sequence to be matched * * Returns: * * whether or not the regular expression matches on the input * */ System.out.println(Pattern.matches(".", "m"));//true [char and comes once] System.out.println(Pattern.matches(".", "8"));//true [char and comes once] System.out.println(Pattern.matches(".", "99"));//false [char but comes more than once] System.out.println(Pattern.matches(".", "uiui"));//false [char but comes more than once] } }Output
true true false falseClick the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/RegexDemo_metachar_d.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/RegexDemo_metachar_d
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/950c9f162cb72194a90be45ab9293fca2b84f41c/BasicJava/RegexDemo_metachar_d/?at=master
See also:
No comments:
Post a Comment