I have the following path :
/data/2/444/test.text
or (without a slash at the start of the path) data/2/444/test.text
I would like to return in JS the following result :
"/2/444/test.text"
I tried with the following: but I managed only to get the base name
new String(str).substring(str.lastIndexOf('/') + 1);
You can use a simple regex to remove the first directory in the path.
str.replace(/^\/?[^/]+\//, '/')
^\/? Optional slash at the beginning of string.[^/]+\// match any non slash character until it encounter a slashconst input = ['/data/2/444/test.text', 'data/2/444/test.text', 'file.txt'];
const output = input.map(str => str.replace(/^\/?[^/]+\//, '/'))
console.log(output);If you only want to replace /data from the beginning you can use:
^\/?data\/
lastIndexOf finds the last occurrence of a string within a string. When you use substring(x) on a string y, it will return the characters of y starting at x. So using lastIndexOf in this use case isn't what you want. You can achieve what you want by using indexOf (finding the first occurrence of a string within a string).
To account for the different formats of your input string (i.e. /data and data), you can just test for that:
function getPathWithoutData(str) {
var strWithoutSlash = str[0] === '/' ? str.substring(1) : str;
return strWithoutSlash.substring(strWithoutSlash.indexOf('/'));
}
You can easily do it without regexes and using slice and indexOf:
const getPath=path=>path.slice(path.indexOf('/',path[0]==="/"?1:0)-path.length);
console.log(getPath('/data/2/444/test.text'));
console.log(getPath('data/2/444/test.text'));This checks if the first char is a / or not, and adjusts the indexOf accordingly to match either the second or first /. Also note how the subtraction gives a negative value, which gets the intended characters from the end, up to the /.
Of course you can do still do it with substring, as you were attempting, but with indexOf instead of lastIndexOf, because you want the 1st or 2nd / not the last one:
const getPath=path=>path.substring(path.indexOf('/',path[0]==="/"?1:0),path.length);
console.log(getPath('/data/2/444/test.text'));
console.log(getPath('data/2/444/test.text'));It's worth mentioning that these may not be as robust as a regex, but are simple enough, and may fit your needs, depending on how the data can vary.
You could use String.prototype.split() and pass it a regex.
const paths = [
"/data/path/one",
"data/path/two"
];
const modifyPath = p => {
const [fallback, newPath] = p.split(/\/?data/);
return newPath || fallback;
}
console.log(paths.map(modifyPath));Or you could use String.prototype.replace()
const paths = [
"/data/path/one",
"data/path/two",
];
const modifyPath = p => {
return p.replace(/\/?data(.*)/, '$1');
}
console.log(paths.map(modifyPath));
data isn't present in the path this will yield undefined.
/data/data?str.split('/data')[1]?