Revision d3035e7c-764a-43e4-975c-070a4f7dedbc - Code Review Stack Exchange

> Your code looks great!

Here, maybe another option that we might exercise would be to possibly do the entire task with an expression, maybe something similar to these:

 ^(.+?\/).+\/(.+)$
 (.+?\/).+\/(.+)

Our first capturing group is non-greedy, collects our desired `path1` for both inputs, followed by a greedy `.+` that'd continue upto the last slash, and our `path2` and `path3` are in this group: `(.+)`, and our desired output can be called using `1円2円`.

####*Escaping might be unnecessary, just following based on the [demo](https://regex101.com/r/yZfVoB/1/)*.

---------

###Test

 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 final String regex = "^(.+?\\/).+\\/(.+)$";
 final String string = "path1/path2/../path3\n"
 	 + "path1/./path2";
 final String subst = "1ドル2ドル";
 
 final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
 final Matcher matcher = pattern.matcher(string);
 
 final String result = matcher.replaceAll(subst);
 
 System.out.println(result);

###Demo

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

 console.log(`path1/path2/../path3
 path1/./path2`.replace(/^(.+?\/).+\/(.+)$/gm, `1ドル2ドル`));



<!-- end snippet -->

###Performance

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

 const repeat = 1000000;
 const start = Date.now();

 for (var i = repeat; i >= 0; i--) {
 	const regex = '/^(.+?/).+/(.+)$/gm';
 	const str = `path1/path2/../path3`;
 	const subst = `1ドル2ドル`;

 	var match = str.replace(regex, subst);
 }

 const end = Date.now() - start;
 console.log("YAAAY! \"" + match + "\" is a match 💚💚💚 ");
 console.log(end / 1000 + " is the runtime of " + repeat + " times benchmark test. 😳 ");

<!-- end snippet -->


### RegEx Circuit

[jex.im](https://jex.im/regulex/#!flags=&re=%5E(a%7Cb)*%3F%24) visualizes regular expressions:


[![enter image description here][1]][1]


 [1]: https://i.sstatic.net/FB7Xx.png