Regular expression html tag pattern
<("[^"]*"|'[^']*'|[^'">])*> |
<("[^"]*"|'[^']*'|[^'">])*>
This regular expression refers to a pattern which start with an opening tag “<" , follow by double quotes "string", or single quotes 'string' but does not allow one double quotes (") "string, one single quote (') 'string or a closing tag > without single or double quotes enclosed. At last, end with a closing tag “>”
Example
package com.w3spoint;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexTest {
private static final String PATTERN =
"<("[^"]*"|'[^']*'|[^'">])*>";
public static void main(String args[]){
List<String> values = new ArrayList<String>();
values.add("<br>");
values.add("<input/>");
values.add("<input value=> >");
Pattern pattern = Pattern.compile(PATTERN);
for (String value : values){
Matcher matcher = pattern.matcher(value);
if(matcher.matches()){
System.out.println("Tag "+ value +" is valid");
}else{
System.out.println("Tag "+ value +" is invalid");
}
}
}
} |
package com.w3spoint; import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern; public class RegexTest {
private static final String PATTERN =
"<("[^"]*"|'[^']*'|[^'">])*>";
public static void main(String args[]){
List<String> values = new ArrayList<String>();
values.add("<br>");
values.add("<input/>");
values.add("<input value=> >");
Pattern pattern = Pattern.compile(PATTERN);
for (String value : values){
Matcher matcher = pattern.matcher(value);
if(matcher.matches()){
System.out.println("Tag "+ value +" is valid");
}else{
System.out.println("Tag "+ value +" is invalid");
}
}
}
}
Output
Tag <br> is valid
Tag <input/> is valid
Tag <input value=> > is invalid |
Tag <br> is valid
Tag <input/> is valid
Tag <input value=> > is invalid
