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Capture matching text format in a string [closed]

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I am trying to write a regex to extract the items in the text below that start with the # and ends with )
const bodyOfText = "#[DataStructures](topic_DataStructures) is one #[Algorithms](topic_Algorithms) branch that could #[Make or Mar](topic_Make or Mar)";
So basically, will want an array that looks like:
["#[DataStructures](topic_DataStructures)", "#[Algorithms](topic_Algorithms)", "#[Make or Mar](topic_Make or Mar)"]

Using string match() we can try:
var bodyOfText = "#[DataStructures](topic_DataStructures) is one #[Algorithms](topic_Algorithms) branch that could #[Make or Mar](topic_Make or Mar)";
var matches = bodyOfText.match(/#\[.*?\]\(.*?\)/g);
console.log(matches);

How to Filter an array of strings based on first word in the string in javascript? [closed]

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With the following array of strings in javascript, is there a way to use the .filter to filter by the first word?
['Desk_One', 'Desk_Two', 'Desk_Three', 'Chair_One', 'Chair_Two']
For example to .filter(x = 'Desk_*')
['Desk_One', 'Desk_Two', 'Desk_Three']
Maybe this needs to be a regex

You can use startsWith() function like this:
let array = ['Desk_One', 'Desk_Two', 'Desk_Three', 'Chair_One', 'Chair_Two'];
let result = array.filter((item)=>item.startsWith(array[0].split('_')[0]));
console.log(result)

Regex to replace 'null-null-1234' to 'xxx-xx-1234' [closed]

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I'm trying to replace string
'null-null-1234' to '***-**-1234'
const p = 'null-null-1234';
const regex = /null/gi;
console.log(p.replace(regex, '***'));
Output => "***-***-1234" NOT AS EXPECTED

p.replace(/null-null/, '***-**')

I think what you actually want to do is to make a distinction between first and second values.
Hence, you probably need 2 regexes.
p.replace(/^null/, '***').replace(/-null-/, '-**-')
The first one will replace the null in first position (if any) by 3 stars, and the second replace will replace a null in the middle (if any) by 2 stars.

How do I check if the value of an input is a number using jQuery [closed]

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I need to check if the value of the input consists of numbers(0-9). Thanks for helping.

You can use Regular Expressions:
var result = /^[\d]+$/.test(yourInput);

Try to use isNumeric like this:
if($.isNumeric( input ) && parseInt(input)<10 && parseInt(input)>=0){
...
}

regular expression in javascript checking for "asdasd<something>asdsada" [closed]

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how would I check for string
<something> in var string = "some chars <something> somechars"

You can use String.match():
var res = string.match(/<something>/g); // ["<something>"]
If there is no match, the value of res will be null. See example on JSFiddle.