java and regular expression

Question

I need to write a regular expression in order to use it in java using pattern and matcher. the regular expression should test if a word inside a text is surrounded by javascript tags. For examples, lets say i have the following text:

**testtesttesttest <script> example of a "text" </script> testtesttesttest**

and i need to check if the word "text" is surrounded by <script> and </script>.

I have split the text to have two texts:

txt1 = testtesttesttest <script> example of a 
txt2 = </script> testtesttesttest

Now i need to check:

if txt1 contains the tag <script> but does not contain after it a tag </script>
if txt2 contains the tag </script> but does not contain before it a tag <script>

Is there a way to do it using the regular expression? Thank you in advance,

Using regex to parse HTML is never a good idea: http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454 — beny23, Jul 15 '14 at 13:23
For the described problem a regular expression is just fine and will do the job. It is not a context sensitive problem (where a push down automaton would be necessary) to check whether there's one opening and one closing surrounding tag! — Kalle Richter, Jul 15 '14 at 13:30

user2640782 · Answer 1 · 2014-07-15T14:19:45.970

First you can get inside of your javascript tag with regular expessions.

final Pattern pattern = Pattern.compile("<script>(.+?)</script>");
    final Matcher matcher = pattern.matcher("**testtesttesttest <script> example of a \"text\" </script> testtesttesttest**");
    matcher.find();
    String insdeOfTag= matcher.group(1);

Then, you can check if string contains "text"

insdeOfTag.contains("text");

You can loop all the results with this:

List<String> values = new ArrayList<String>();
while (matcher.find()) {
        values.add(matcher.group(1));
}

The values list will contain the texts inside the javascript tags.

for (String text : values) {
//you can look for the word "text" on a specific index in here.
}

Thank you, but the text might contain multiple word "text" inside script tags, and in my case i need to do the check on a word "text" on a specific index, so i will need to loop all the results of matcher and check if the word "text" has the same index. — user2318955, Jul 15 '14 at 14:10

java and regular expression

1 Answers1