Regex regular-expression Java String

Question

I have code:

private static final Pattern TAG_REGEX = Pattern.compile("<p>(.+?)</p>");
private static List<String> getTagValues(final String str) {
    final List<String> tagValues = new ArrayList<String>();
    final Matcher matcher = TAG_REGEX.matcher(str);
    while (matcher.find()) {
        tagValues.add(matcher.group(1));
    }
    return tagValues;
}
            System.out.println(Arrays.toString(getTagValues(stringText).toArray()));

and i want get from this:

"<html><head></head><body><p>Aa , aa.</p><p><b>Aa aa, aa.</b></p><p>Aa aa aa, aa.</p><p><i>Aa, aa.</i></p><p><b><i>B, b, b.</i></b></p><b>Aa aa, aa.</b></body></html>"

I want only the text beetwen  and 

i want get only this: 

"Aa aa Aa aa aa Aa aa aa aa Aa aa B b b"

But i don't know what i have to write in Pattern.compile("");anyone help?

Jsoup can also pick all the p tags data but again issue will be this Aa aa, aa. because is not inside p and somewhere you also have b tag inside p — Pavneet_Singh
– Pavneet_Singh, Commented Feb 21, 2017 at 18:17

Pavneet_Singh · Accepted Answer · 2017-02-22 16:53:37Z

2

I recommend to use JSOUP parser to extract your data from HTML code

1.) Parse your data as Document using Jsoup.parse(string) function.

2.) Get the data of body tag as Element.

3.) Fetch the text of Element tag using element.text().

4.) Optionally you can use replaceAll("\\s*[,.]\\s*","") to remove all commans and dots and format spaces.

    String stringText = "<html><head></head><body><p>Aa , aa.</p><p><b>Aa aa, aa.</b></p><p>Aa aa aa, aa.</p><p><i>Aa, aa.</i></p><p><b><i>B, b, b.</i></b></p><b>Aa aa, aa.</b></body></html>";
    Document document =Jsoup.parse(stringText);
    Element element=document.body();
    String plain_String = element.text().replaceAll("\\s*[,.]\\s*"," ");
    System.out.println(element.text()); // Actual text
    System.out.println(plain_String);   // Formatted text

Output :

Aa , aa. Aa aa, aa. Aa aa aa, aa. Aa, aa. B, b, b.Aa aa, aa.
Aa aa Aa aa aa Aa aa aa aa Aa aa B b b Aa aa aa

Download Jsoup and add it as a dependency

\\s*[,.]\\s* :\\s* match zero or more spaces

[,.] : match any character mentioned inside [] mean ,.

If you insist the regex solution then use

1.) First remove all unwanted characters like ,. and spaces with replaceAll("\\s*[.,]\\s*", " ")

2.) Use regex <p[<>ib]*>([\\w\\s]+)<\\/[\\w]> with Pattern and Matcher to find your text between tags

3.) Append the found text in StringBuilder and display the result

Code

    String str = "<html><head></head><body><p>Aa , aa.</p><p><b>Aa aa, aa.</b></p><p>Aa aa aa, aa.</p><p><i>Aa, aa.</i></p><p><b><i>B, b, b.</i></b></p><b>Aa aa, aa.</b></body></html>";
    Pattern pattern = Pattern.compile("<p[<>ib]*>([\\w\\s]+)<\\/[\\w]>");
    Matcher matcher = pattern.matcher(str.replaceAll("\\s*[.,]\\s*", " "));
    StringBuilder builder = new StringBuilder();
    while (matcher.find()) {
        builder.append(matcher.group(1));
    }
    System.out.println(builder);

Output :

Aa aa Aa aa aa Aa aa aa aa Aa aa B b b

edited Feb 22, 2017 at 16:53

answered Feb 21, 2017 at 18:11

Pavneet_Singh

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2 Comments

Pavneet_Singh Over a year ago

just in case , if you want all p tags data , use document.getElementsByTag("p").text() but again resultant string will not include Aa aa, aa. text data because it's not inside p tag

JavaCoder Over a year ago

yes i edit my post that i want this text without Aa aa, aa. but i can;t use this Jsuop because i must send only file in java without jsoup

artemisian · Accepted Answer · 2017-02-22 23:21:22Z

0

You don't need Pattern nor Matcher for that, you could do a String replace instead:

str.replaceAll(".*?(.*).*", " $1 ").replaceAll(".*?(.*?).*?", " $1 ").replaceAll("<[/a-z]+>", " ").replaceAll("[,.]", " ").replaceAll(" +", " ")

It doesn't look pretty but it gets the job done :)

edited Feb 22, 2017 at 23:21

answered Feb 21, 2017 at 18:13

artemisian

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6 Comments

JavaCoder Over a year ago

thanks it is helpful but i add some edit to my post because outpus was wrong, i don't need Aa aa, aa. in my output, so you know what i must edit you code that it will work?

artemisian Over a year ago

I've update my answer to align with the edit to your answer. Please up-vote my answer if it works for you. Thanks.

JavaCoder Over a year ago

" \$1 " this give me a error in eclipse, Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ ) this is error

artemisian Over a year ago

I've fixed my answer. Please try now

JavaCoder Over a year ago

Yes it works ! Thank you. Is it any site where i put the text and it return the characters that i have to enter ? like this : replaceAll(".*?(.*).*", " $1 ") ? Or i have to learn all characters what it means?

|

Youcef LAIDANI · Accepted Answer · 2017-02-21 18:21:52Z

0

You can try this :

String str = "<html><head></head><body><p>Aa , aa.</p><p><b>Aa aa, aa.</b></p><p>Aa aa aa, aa.</p><p><i>Aa, aa.</i></p><p><b><i>B, b, b.</i></b></p><b>Aa aa, aa.</b></body></html>";
String start = ">", end = "<";
String regexString = Pattern.quote(start) + "(.*?)" + Pattern.quote(end);
Pattern pattern = Pattern.compile(regexString);
Matcher matcher = pattern.matcher(str.replaceAll("[.,]", ""));
while (matcher.find()) {
    if (!matcher.group(1).replaceAll("\\s{2,}", " ").trim().equals("")) {
        System.out.print(matcher.group(1).replaceAll("\\s{2,}", " ") + " ");
    }
}

This gives you :

Aa aa Aa aa aa Aa aa aa aa Aa aa B b b Aa aa aa

answered Feb 21, 2017 at 18:21

Youcef LAIDANI

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1 Comment

JavaCoder Over a year ago

thanks it is helpful but i add some edit to my post because outpus was wrong, i don't need Aa aa, aa. in my output, so you know what i must edit you code that it will work?

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