Java Regular expression betweenStrings

Question

I have a FIle with following kind of input

<title>Page title1</title>
<title>Page title2</title>
<title>Page title3</title>
<title>Page title4</title>
<title>Page title5</title>
<title>Page title6</title>
<title>Page title7</title>
<title>Page title8</title>
<title>Page title9</title>

I want to extract contents between title I use this code

Pattern pattern = Pattern.compile("(?i)(<title.*?>)(.+?)(</title>)");
Matcher matcher = pattern.matcher(test);
 while (matcher.find()) {
System.out.println(matcher.group().toString());
 }

but I get no output. What am I doing wrong?

Kent · Accepted Answer · 2014-01-22 15:38:44Z

2

without grouping:

(?<=<title>)[^<]*

but if it is a valid xml doc, better avoid to parse it with regex.

answered Jan 22, 2014 at 15:38

Kent

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1 Comment

Yogi Over a year ago

Hi. Its not. I tried this regex too, its is still not working.. Pattern pattern = Pattern.compile("(?<=<title>)[^<]*");

JaTochNietDan · Accepted Answer · 2014-01-22 15:42:26Z

0

Using your example, simply specify which group you want when printing, which for your purposes would be group 2:

System.out.println(matcher.group(2).toString());

Additionally, considering you get "no output", you should ensure your input string "test" actually contains what you think it does. I recommend this based on the fact that your code does work and it should print the entire match as is.

answered Jan 22, 2014 at 15:42

JaTochNietDan

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Comments

Nambi · Accepted Answer · 2014-01-22 15:48:45Z

0

try this pattern (?<=<title>).*(?=<\\/title>)

answered Jan 22, 2014 at 15:48

Nambi

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java seeker · Accepted Answer · 2014-01-22 16:00:01Z

0

 Pattern pattern = Pattern.compile("(?i)(<title.*?>)(.+?)(</title>)");
 Matcher matcher = pattern.matcher(test);
 while (matcher.find()) 
 {
   System.out.println(matcher.group().toString());
 }

Above is very costly operation. you can simply use indexof on string

String str="<title>Page title1</title>";
int index=str.indexOf("<title>");
int lastIndex=str.indexOf("</title>");
String literal=str.substring(index+5,lastIndex);

answered Jan 22, 2014 at 16:00

java seeker

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