用于url css文件名和扩展名的Java正则表达式

Question

I want to get the whatevername.css from url's but I'm doing something wrong, the urls might change and the names also so it could be

www.asdasad.as/asdas/asdas/mystyles.css

asda.com/styles.css etc etc

I've tried with this (but it doesn't work "cannot return value from method whose result is void"):

String fileName = "www.whateverpage.es/style.css";
int idx = fileName.replaceAll("\\", "/").lastIndexOf("/");
return idx >= 0 ? fileName.substring(idx + 1) : fileName;

Answer 1

replaceAll uses regex as parameter and to represent \\ literal in regex engine you need to pass \\\\ literal so you would need to write it as "\\\\\\\\" String

int idx = fileName.replaceAll("\\\\", "/").lastIndexOf("/");

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To get rid of this madness try maybe replace('\\\\','/') instead replaceAll . This method wont use regex, but only character switch, so your code can look like

int idx = fileName.replace('\\', '/').lastIndexOf("/");

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Edit after your update

cannot return value from method whose result is void

this error is caused by fact that return type of your method is void instead of String . Change your method declaration from void yourMethodsName() to String yourMethodsName() .