remove a substring from a string in javascript with multiple scenarios

Question

Suppose I have a string hello and I want it to subtract from the strings.

hello_my_good_world
my_hello_good_world
my_good_hello_world

And the output from above strings must be like following respectively.

my_good_world
my_good_world
my_good_world

Please note that how underscore _ got removed too. If string hello is at the start then it should remove underscore ahead, If it is in the middle then it should remove either next or previous underscore. So I don't have duplicate underscores. And if substring is at the end then it should remove previous underscore. I tried using JS replace method but I can remove only substring. Haven't figured out how to handle duplicate underscores to eliminate them too.

Luis felipe De jesus Munoz · Accepted Answer · 2018-08-10 20:15:13Z

8

use .replace(/hello_|_hello/g,'')

console.log("hello_my_good_world".replace(/hello_|_hello/g,''))
console.log("my_hello_good_world".replace(/hello_|_hello/g,''))
console.log("my_good_hello_world".replace(/hello_|_hello/g,''))

answered Aug 10, 2018 at 20:15

Luis felipe De jesus Munoz

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1 Comment

Asad ullah Over a year ago

Thanks Bro.. Worked perfectly as expected.

pete · Accepted Answer · 2018-08-10 20:19:22Z

3

You could also do multiple replacements.

const tests = [
    'hello_my_good_world',
    'my_hello_good_world',
    'my_good_hello_world',
]

const replaced = tests.map(s => {
    const replacement = s
        .replace('hello', '')   // eliminate 'hello'
        .replace('__', '_')     // eliminate double underscore
        .replace(/^_/g, '')     // eliminate leading underscore
        .replace(/_$/g, '')     // eliminate trailing underscore
    
    return replacement;
});

console.log({
    replaced,
});

answered Aug 10, 2018 at 20:19

pete

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Comments

CRice · Accepted Answer · 2018-08-10 20:22:12Z

2

Another option is to split the string on _, filter out "hello", and rejoin with _:

console.log("hello_my_good_world".split("_").filter(s => s !== "hello").join("_"))
console.log("my_hello_good_world".split("_").filter(s => s !== "hello").join("_"))
console.log("my_good_hello_world".split("_").filter(s => s !== "hello").join("_"))

answered Aug 10, 2018 at 20:22

CRice

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