Is there any NOT operator in Regex

Question

String :

The car has <ex id=\"3\"/><g id=\"4\">attributes</g><g id=\"5\">, such as weight and color

using the Regex : (<.*?>)

i was able to get the tags like <ex id=\"3\"/> and <g id=\"4\">

but how can we remove all the string part from the sentence so that the final string would look like <ex id=\"3\"/><g id=\"4\"></g><g id=\"5\">

with only the tags.

Q: Remove anything from the sentence but tags (NOT operator for tags).

Use same regex in Matcher.find() and get your new string using matcher.group(0) — anubhava
– anubhava, Commented Feb 9, 2021 at 7:24

Akshar · Accepted Answer · 2021-02-09 07:35:38Z

4

The below code creates a new string with the required tags.

public static void main(String[] args)
{
    String line = "The car has <ex id=\\\"3\\\"/><g id=\\\"4\\\">attributes</g><g id=\\\"5\\\">, such as weight and color";
    String regex = "(<.*?>)";
    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(line);
    StringBuilder compactline = new StringBuilder();
    while (matcher.find()) {
        compactline.append(matcher.group());
    }
    System.out.println("Original Line : " + line);
    System.out.println("Compact Line : " + compactline);
}

Output

Original Line : The car has <ex id=\"3\"/><g id=\"4\">attributes</g><g id=\"5\">, such as weight and color

Compact Line : <ex id=\"3\"/><g id=\"4\"></g><g id=\"5\">

answered Feb 9, 2021 at 7:35

Akshar

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backToStack · Accepted Answer · 2021-02-09 07:44:58Z

0

String  segment ="The car has <ex id=\"3\"/><g id=\"4\">attributes</g><g id=\"5\">, such as weight and color;
String regex="(<.*?>)";
Pattern pattern = Pattern.compile(regex);
Matcher matcher=pattern.matcher(segment);
   while(matcher.find())
      {
        System.out.println("matcher ="+matcher.group());
      }

Output :

matcher =<ex id=\"3\"/>
matcher =<g id=\"4\">
matcher =</g>
matcher =<g id=\"5\">
matcher =</g>
matcher =<g id=\"6\">
matcher =</g>
matcher =<g id=\"7\">
matcher =</g>

On trying the suggestion by @anubhava This code snippet worked and fetched only the tags present in the string .

answered Feb 9, 2021 at 7:44

backToStack

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