Replace digits in String url

Question

I have a String of url which can be represented as

urlString = String1 + "/23px-" + String2.

The amount of pixels is different every time (can be 23px, 19px and so on). The length of String1 and String2 unknown and varies. String1 can also contain two digits but never in combination with "px".

I tried to use the replace methods that all my urlStings have, let's say, 25px:

urlString.replace("\\d+px","25px")
urlString.replace("\\d{2}px","25px")

but it doesn't work. Where's the mistake?

You need replaceAll (replace doesn't take a regular expression). — Elliott Frisch
– Elliott Frisch, Commented Aug 15, 2016 at 2:45

Ramachandran.A.G · Accepted Answer · 2016-08-15 02:49:25Z

1

You were extremely close , replaceAll takes a regex. replace takes in a CharSequence/String. This works :

    String urlString = "String1" + "/23px-" + "String2";

    System.out.println(urlString.replaceAll("\\d+px", "25px"));
    System.out.println(urlString.replaceAll("\\d{2}px", "25px"));

replaceAll(String regex, String replacement) Replaces each substring of this string that matches the given regular expression with the given replacement.

answered Aug 15, 2016 at 2:49

Ramachandran.A.G

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