Java regex URL prefix removal

Question

I have a set of URLs. Some of them have a string www as substring and some of them haven't. I need to remove prefixes in each URL. I tried remove this prefixes using many variants of regexp:

newStr = str.replaceAll("http://|http://www.", "");
newStr = str.replaceAll("^http://|http://www.$", "");
newStr = str.replaceAll("http://|http://www.", "");

where str - is an inputted URL string, and newStr is the URL after replacement. Each of these variants replaces only http:// prefix, but www. remains in result. How I can change my regexp to remove http:// string as well as http://www. string?

I know that I can use replaceAll() twice:

newStr = str.replaceAll("http://", "").replaceAll("www.", "");

But what should I do to remain one replaceAll() and edit only the regular expression?

vbezhenar · Accepted Answer · 2015-03-02 00:30:34Z

4

newStr = str.replaceFirst("^(http://)?(www\\.)?", "");

please note that . in regex means anything so you need to escape it, or you will strip first 4 symbols from wwwiscool.com and you probably don't want that. And you probably want to replace only the first matching prefix.

answered Mar 2, 2015 at 0:30

vbezhenar

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1 Comment

Guilherme Over a year ago

for https and http "^(http[s]?://)?(www\\.)?"

Skizo-ozᴉʞS ツ · Accepted Answer · 2015-03-02 00:20:37Z

1

You can use str.replace, for example :

String str = "http://www.google.com";
str.replace("http://","").replace("http:// www.","").replace("www.","");

For more information about str.replace

answered Mar 2, 2015 at 0:20

Skizo-ozᴉʞS ツ

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2 Comments

Skizo-ozᴉʞS ツ Over a year ago

@Atuos That was just an example.

VeLKerr Over a year ago

Thanks for the answer. But what regexp I should use to call the replace() method only once?

Bholendra Singh · Accepted Answer · 2023-03-27 13:07:46Z

0

// removing http val withOutHttp=contentUrl!!.split("//")[1]

        // removing www.domain.com
        val splitUrl: MutableList<String> = withOutHttp.split("/").toMutableList()
        splitUrl.removeAt(0)    // removing the host

        // adding array to string
        contentUrl=splitUrl.joinToString("/")

answered Mar 27, 2023 at 13:07

Bholendra Singh

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