Java regex to replace only text in html file
Question
I have to write some code in Java which highlights text of a html file displayed in a JTextPane .
For highlighting I replace "match" with "<span style=\\"background-color: #FFFF00\\">match</span>" and set the whole replaced text in the JTextPane . Everything works fine! I do this with the help of java.util.regex.Pattern and java.util.regex.Matcher .
Now, I determinded a problem: The matcher also matches text within a html tag. For example this line:
<pre><a name="hello-world">Hello World</a></pre>
I need a regex, to create a java.util.regex.Pattern that only searchs in the String "Hello World".
So, if I want to highlight the matches of "e" it should looks like
<pre><a name="hello-world">H<span style=\"background-color: #FFFF00\">e</span>llo World</a></pre>
Thank you very much for your help!!
2 answers
solution1
0 2016-12-12 14:23:59
I would do something like:
Pattern pattern = Pattern.compile("^>(.*)$<");
Matcher matcher = pattern.matcher(matchedTextBuilder.toString());
while (matcher.find()) {
String matchedFoundText = matcher.group();
}
A better approach:
public static void main(String[] args) {
String originalString = "dfedf >Hello< href= ui /> Hello< another";
StringBuilder sb = new StringBuilder("");
Pattern pattern = Pattern.compile(">(\\s+)?\\w+(\\s+)?<");
Matcher matcher = pattern.matcher(originalString);
int endIndex = 0;
while (matcher.find()) {
String matchedFoundText = matcher.group();
sb.append(originalString.substring(endIndex, matcher.start() + 1));
sb.append(matchedFoundText.substring(1, matchedFoundText.length() - 1).replaceAll("e",
"<span style=\"background-color: #FFFF00\">e</span>"));
sb.append("<");
endIndex = matcher.end();
}
sb.append(originalString.substring(endIndex + 1));
System.out.println(sb.toString());
}
solution2
0 2016-12-12 17:37:34
Try it with Jsoup a html parser which can be used to scrape and parse HTML from a URL, file, or string but also to manipulate the HTML elements, attributes, and text. Example for your case:
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
public class NewClass2 {
public static void main(String args[]) {
String html = " <!DOCTYPE html>\n" +
"<html>\n" +
"<head>\n" +
"<title>Page Title</title>\n" +
"</head>\n" +
"<body>\n" +
"<h1>This is a Heading which should match</h1>\n" +
"<p>This is a paragraph which should also match.</p>\n" +
"</body>\n" +
"</html> ";
String matchWord = "match";
Document doc = Jsoup.parse(html);
System.out.println("before : \n");
System.out.println(doc.toString()+"\n");
Elements matchingElements = doc.getElementsContainingOwnText(matchWord);
for (Element e : matchingElements) {
e.html(e.html().replace(matchWord,"<span style=\"background-color: #FFFF00\">"+matchWord+"</span>"));
}
System.out.println("after : \n");
System.out.println(doc.toString());
}
}
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