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consider a string which has question marks, numbers , letters [closed] - javascript

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consider a string which has question marks, numbers , letters.
check for three question marks between two numbers where in when adding those two numbers it should be 10.In that case return it as string true or else string false.example: "bdhfr6???4hfyrt5???eee5".Above example return string true because between 6 and 4 there are 3 question marks and between 5 and 5 exactly 3 question marks
or else false

I leave the refactoring of regex on you, but this is something you can do using String.prototype.match.
function checkStr(str) {
let match = str.match(/(\d)\?{3}(\d)/);
return match && +match[1] + +match[2] === 10;
}
let out = checkStr('bdhfr6???3hfyrt5???eee5');
console.log(out)
out = checkStr('bdhfr6???4hfyrt5???eee5');
console.log(out)

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I have a string with HTML in between. What I want to achieve is add a space in between after every 2nd character.
For example for input like below -
'<span>234567</span><span>34526754</span>'
'<span>23 45 67</span><span>34 52 67 54</span>'
How can I achieve this in JavaScript?

let str = '<span>234567</span><span>34526754</span>'
str.match(/(?<=\<span>).*?(?=<\/span>)/g).forEach(s=>{
str = str.replace(s, s.match(/.{2}/g).join(' '))
})
console.log(str)

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I would like to have a RegEx (in javascript) to validate below conditions.
Value should have atleast 3 chars
First and last char should be single quote.
please advice how the regex should be?
Thanks in advance.

If you mean three chars total:
const regex = /'.+'/;
If you mean three chars plus quotes:
const regex = /'.{3,}'/;
More info:
https://javascript.info/regexp-quantifiers

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I don't no how regex works. but I have a url like:
http://localhost/BetaLeren/public/dashboard/general/video.php?video=13&time=19
but I want it that way:
http://localhost/BetaLeren/public/dashboard/general/video.php?video=13
How I can i do that with refex?
or is there a better way?

If you'll always have video= followed by time=, you could use the following regex:
const link = 'http://localhost/BetaLeren/public/dashboard/general/video.php?video=13&time=19';
const updatedLink = link.match(/^.+video=\d+/)[0];
console.log(updatedLink);
^ represents the beginning of the string.
.+ represents any character 1 or more times.
\d+ represents any digit 1 or more times.

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I know that in string with name example example.slice(0, -1) it removes last character from it.
How does it do that? How slice(0, -1) removes last character from a string?

Because it is by the definition.
A negative index can be used, indicating an offset from the end of the sequence.
Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice
It works like length of the string is given to second parameter.
const s = 'abcdefg'
console.log(s.slice(0, -1 + s.length))
// abcdef
console.log(s.slice(0, -1))
// abcdef

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I cannot understand the function used below that just splits a string on '.'.
Could you help me understand why it uses the extra replace statements?
function dotSplit (str) {
return str.replace(/\1/g, '\u0002LITERAL\\1LITERAL\u0002')
.replace(/\\\./g, '\u0001')
.split(/\./).map(function (part) {
return part.replace(/\1/g, '\\.')
.replace(/\2LITERAL\\1LITERAL\2/g, '\u0001')
})
}

Here, \1 means to match the character whose octal representation in Latin-1 encoding is 1. That character is SOH, or the start of heading character. What it does above is replace all occurrences of that with \u0002LITERAL\\1LITERAL\u0002, where \u2002 stands for the character STX(Start of text).
You can try it here:
https://regex101.com/r/n9LaJY/1