Java String Matches Illustration - Regular Aspect Tutorial
String Matching Example inwards Java
String matches method inwards Java tin endure used to evidence String against regular appear inwards Java. String matches() method is 1 of the most convenient means of checking if String matches to a regular appear inwards Java or not. Quite oftentimes nosotros bespeak to write code which needs to cheque if String is numeric, Does String contains alphabets e.g. H5N1 to Z or a to Z, How to cheque if String contains a detail digit half-dozen times etc. There are in addition to thus many cases inwards Java programming where nosotros bespeak regular expression. If yous are familiar amongst Java's regular appear API than yous must know almost java.util.regex.Pattern in addition to java.util.regex.Matcher class, these shape provides regular appear capability to Java API. matches method of String shape truly delegate asking to these classes. Anyway regular expression tin endure best larn past times seeing few examples in addition to this is what nosotros are going to create inwards this Java String matches example tutorial.
String matches method inwards Java tin endure used to evidence String against regular appear inwards Java. String matches() method is 1 of the most convenient means of checking if String matches to a regular appear inwards Java or not. Quite oftentimes nosotros bespeak to write code which needs to cheque if String is numeric, Does String contains alphabets e.g. H5N1 to Z or a to Z, How to cheque if String contains a detail digit half-dozen times etc. There are in addition to thus many cases inwards Java programming where nosotros bespeak regular expression. If yous are familiar amongst Java's regular appear API than yous must know almost java.util.regex.Pattern in addition to java.util.regex.Matcher class, these shape provides regular appear capability to Java API. matches method of String shape truly delegate asking to these classes. Anyway regular expression tin endure best larn past times seeing few examples in addition to this is what nosotros are going to create inwards this Java String matches example tutorial.
String matches illustration Java
In this String matches tutorial nosotros volition run into ii examples of matches component subdivision of String shape :
1) How to cheque if string contains whatever alphabetic characters or non inwards both e.g. A-Z or a-Z
2) How to cheque if string contains whatever numeric digits e.g. digits from 1-9 or 0-9
In next illustration of matching String using regular appear nosotros accept used ii regular appear meta characters e.g. dot (.) which matches whatever grapheme in addition to astrick or star (*) which matches whatever release of times. By using .* we are effectively matching whatever grapheme coming whatever release of fourth dimension inwards root String inwards Java.
/**
* Java plan to demonstrate how to purpose usage String matches method
* Java plan to demonstrate how to purpose usage String matches method
* to jibe regular appear inwards String.
*
* @author Javin
*/
public class StringMatchExample {
public static void main(String args[]) {
String[] alphabets = {"", "12345", "A12345", "12345B",
* @author Javin
*/
public class StringMatchExample {
public static void main(String args[]) {
String[] alphabets = {"", "12345", "A12345", "12345B",
"12345a" , "abcd" , "aa343"};
for(String alphabet : alphabets) {
System.out.println(" does " + alphabet +
" contains alphabetic words : " + alphabet.matches(".*[A-Za-z].*"));
}
//checking if String contains digits or not
String[] numbers = {"1234" , "+1234", "234a"};
for(String release : numbers) {
System.out.println(" release " + release + " contains exclusively 1-9 digits : "
+ number.matches(".*[1-9].*"));
}
}
}
Output:
does contains alphabetic words : false
does 12345 contains alphabetic words : false
does A12345 contains alphabetic words : true
does 12345B contains alphabetic words : true
does 12345a contains alphabetic words : true
does abcd contains alphabetic words : true
does aa343 contains alphabetic words : true
release 1234 contains exclusively 1-9 digits : true
release +1234 contains exclusively 1-9 digits : true
release 234a contains exclusively 1-9 digits : true
for(String alphabet : alphabets) {
System.out.println(" does " + alphabet +
" contains alphabetic words : " + alphabet.matches(".*[A-Za-z].*"));
}
//checking if String contains digits or not
String[] numbers = {"1234" , "+1234", "234a"};
for(String release : numbers) {
System.out.println(" release " + release + " contains exclusively 1-9 digits : "
+ number.matches(".*[1-9].*"));
}
}
}
Output:
does contains alphabetic words : false
does 12345 contains alphabetic words : false
does A12345 contains alphabetic words : true
does 12345B contains alphabetic words : true
does 12345a contains alphabetic words : true
does abcd contains alphabetic words : true
does aa343 contains alphabetic words : true
release 1234 contains exclusively 1-9 digits : true
release +1234 contains exclusively 1-9 digits : true
release 234a contains exclusively 1-9 digits : true
Though yous tin purpose Pattern in addition to Matcher shape for regular appear inwards Java. matches method of String is overnice shortcut in addition to yous tin speedily cheque if a detail String matches to a regular appear or not. These String jibe examples are merely tip of iceberg inwards damage of regular appear but it does exhibit how to purpose jibe method of String inwards Java.
Further Learning
Data Structures in addition to Algorithms: Deep Dive Using Java
How to compare ii String inwards Java
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