Regex to match hashtag character with string format in javascript

Question

I need a Regex to match a certain string format in javascript,

A hashtag symbol '#' has to be first and last character , There must be strings between these two characters,

If the string is more than one there must be two hashtag '##' symbol between each of them there is no limit to strings number.

Ex.

#string1##string2##string3##...##string4#
#string1#
#string##string2#

What is your expectation on this? You want to print true/false values or all matched strings? — Nick Vu
– Nick Vu, Commented Apr 18, 2022 at 10:35
in your examples you havent provided the expected output..... — mrtechtroid
– mrtechtroid, Commented Apr 18, 2022 at 10:36
I need to print true if it matches with the formats in questiong @mrtechtroid — AnotherOne
– AnotherOne, Commented Apr 18, 2022 at 10:39

Nick Vu · Accepted Answer · 2022-04-18 10:51:43Z

3

You can check the below regex with this pattern

#[^\#]+#: All characters (except #) between ##

(#[^\#]+#)+: At least a string matched the pattern

^ and $: Start and end of regex

const checkRegex = (value) => {
  const regex = /^(#[^\#]+#)+$/
  return regex.test(value)
}

console.log(checkRegex("#test")) //false
console.log(checkRegex("#test#")) //true
console.log(checkRegex("#test##")) //false
console.log(checkRegex("#test##test#")) //true
console.log(checkRegex("#test##test##")) //false

.as-console-wrapper { max-height: 100% !important; top: 0; }

edited Apr 18, 2022 at 10:51

answered Apr 18, 2022 at 10:49

Nick Vu

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