Hi below is array of strings
const arr = [
"list/1/item/1/",
"some-domain/2/item/2/",
"item/3/",
"some-domain/4/item/5/subitem/1/",
]
i have to filter those strings that start with string "item/3/" or ends with string "item/3/"
so from above array expected filtered array is like below,
const filtered_arr = [
"list/1/item/1/",
"some-domain/2/item/2/",
"item/3/",
]
from the filtered array i want to get the number after "/item/". so from above filtered array the expected output is
const arr_ids = ["1", "2", "3"]
what i have tried,
i have used below to match those strings that start or end with /item/3/
const filtered_arr = arr.map(str) => {
return str.match(/item\/[0-9](\/)?$/g);
}
this gives the filtered_arr
const filtered_arr = [
"list/1/item/1/",
"some-domain/2/item/2/",
"item/3/",
]
but how do i map through each array item and get the number after string "/item/".
could someone help me with this. thanks.
Use filter to filter paths either starting or ending in item/\d+/. Then use map to extract the item number from each matching path.
const arr = [
"list/1/item/1/",
"some-domain/2/item/2/",
"item/3/",
"some-domain/4/item/5/subitem/1",
];
var output = arr.filter(x => x.match(/^item\/\d+|\bitem\/\d+\/$/))
.map(x => x.match(/(?<=^item\/)\d+|(?<=\bitem\/)\d+(?=\/$)/)[0]);
console.log(output);This may help:
const filtered_arr = arr.map(str) => {
const match = str.match(/\/item\/(\d)/);
return(match[1]);
}