Replace first occurrence of character in Android/Java?

Question

I would like to take the 's' out of http.

 https://joy.tothewor.ld/today/and/tommorrow

 http://joy.tothewor.ld/today/and/tommorrow

What's the fastest/less expensive way?

substring, string builder, something newer in Android's SDK?

The least expensive is if(string.startsWith("https:")) string = "http"+string.substring(5); — Holger
– Holger, Commented Feb 12, 2018 at 15:21

stinepike · Accepted Answer · 2014-01-03 07:34:44Z

21

String.replaceFirst will do the job.

String output = input.replaceFirst("s","");

answered Jan 3, 2014 at 7:34

stinepike

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Evgeniy Dorofeev · Accepted Answer · 2014-01-03 07:48:41Z

4

String.replaceFirst is heavyweight

 public String replaceFirst(String regex, String replacement) {
        return Pattern.compile(regex).matcher(this).replaceFirst(replacement);
 }

this is the fastest way

str = str.substring(0, 4) + s.substring(5);

edited Jan 3, 2014 at 7:48

answered Jan 3, 2014 at 7:41

Evgeniy Dorofeev

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3 Comments

sirvon Over a year ago

public String replaceSS(String s) { String xincomingScene; xincomingScene = xincomingScene.substring(s, 4) + s.substring(4); return xincomingScene; }

sirvon Over a year ago

the method substring(int,int) in the Type String is not applicable for the arguments(String, int)

Holger Over a year ago

That’s of course only correct, if you know that the intended character is at the index 4. But if you know beforehand that str starts with "https" and is supposed to be changed to "http…", it might be even faster to say str = "http" + s.substring(5);

Ruchira Gayan Ranaweera · Accepted Answer · 2014-01-03 07:36:59Z

1

You can try this

String str="https://joy.tothewor.ld/today/and/tommorrow"
                                            .replace("https://","http://");

answered Jan 3, 2014 at 7:36

Ruchira Gayan Ranaweera

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2 Comments

stinepike Over a year ago

that is also a good one .. actually there are plenty of options .. :) .. +1

sirvon Over a year ago

but whats the least expensive

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