Java Regex replace all between two tags, non XML [duplicate]

Question

I've been looking all night but none of the other answers satify my needs. They don't even run http://regexr.com/ . What i'm looking is to replace all between <whatever> replace this stuff </whatever>

public void updateValue(String tag, String value) {
    content = content.replaceAll("<"+tag+">(.?+)</"+tag+">", value);
}

public void updateValue(String tag, int value) {
    content = content.replaceAll("<"+tag+">(.?+)</"+tag+">", value+"");
}

public void updateValue(String tag, File value) {
    content = content.replaceAll("(&<"+tag+">=)[^&]*(&</"+tag+">=)", value.getPath());      
}

None of them work at all.

EDIT

Current approach, tags are beign removed along with it's content by regex.

private void replaceValue(String tag, String value) {
    content = content.replaceAll("<"+tag+">(.*?)<\\/"+tag+">", "<"+tag+">"+value+"</"+tag+">");
}

How don't they satisfy your needs? .?+ is incorrect syntax as that site tells you. What are your needs anyway? — Ken Y-N
– Ken Y-N, Commented Jul 31, 2017 at 7:53

Youcef LAIDANI · Accepted Answer · 2017-07-31 20:37:46Z

1

It not work because the pattern you are using (.?+) is a little weird, it means match any character . optional ? one or more time + check your regex here, to solve your problem you have to make some changes you can use:

content = content.replaceAll("<"+tag+">(.+?)<\\/"+tag+">", value);
//--------------------------------------^^^---^^

So you have to use (.+?), (.?+), and you have to espace the / with \/.

check the regex demo

Edit

In the second case you have to use patterns with groups, so you have to match the first tag name then the value between the tags then the closed tag, you can use this :

private static void replaceValue(String tag, String value) {
    String regex = "<(.*?)>(.*?)</(.*?)>";
    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(content);

    if (matcher.find()) {                                                
        content = content.replaceAll(matcher.group(1), tag)
                .replaceAll(matcher.group(2), value)
                .replaceAll(matcher.group(3), tag);
    }
    System.out.println(content);
}

In case of

String content = "<MySQL.port>3306</MySQL.port>";

and tag = "tag_name", value = "XXXX", the reslt is :

<tag_name>XXXX</tag_name>

edited Jul 31, 2017 at 20:37

answered Jul 31, 2017 at 8:06

Youcef LAIDANI

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7 Comments

Wesos de Queso Over a year ago

It doesn't work with empty content between tags, and its removing tags aswell. (i can add'em manually if necessary). EDIT replacing + by * solved the empty case, but tags are still beign removed.

Youcef LAIDANI Over a year ago

@WesosdeQueso what should the output look like?

Wesos de Queso Over a year ago

<MySQL.port>3306</MySQL.port> to <MySQL.port>XXXX</MySQL.port>, for example. It's working but i have to rewrite both <MySQL.port>and </MySQL.port> tags. It's doing : <MySQL.port>3306</MySQL.port> to XXXX

Youcef LAIDANI Over a year ago

so <MySQL.port> can be any thing else or not?

Wesos de Queso Over a year ago

I think i'm gonna stick with the current one i have. Thanks for your help.

|

Lukas Körfer · Accepted Answer · 2017-07-31 08:59:18Z

1

content = content.replaceAll("<tag>(.*?)</tag>", value);

Edited answer for accepting tag from parameter:

content = content.replaceAll("<"+tag"+">(.*?)</"+tag+">", value);

edited Jul 31, 2017 at 8:59

Lukas Körfer

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answered Jul 31, 2017 at 8:02

vaibhav

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4 Comments

Egan Wolf Over a year ago

This will replace tag name. It's not what OP is looking for.

vaibhav Over a year ago

check edited ans

Egan Wolf Over a year ago

Now it will replace only tags named tag. OP wants to have ability to replace content of any tag.

vaibhav Over a year ago

Accept that tag as some value.

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