Javascript Regex to filter String

Question

I need Regex to filter string to fit with the following conditions :

The total length of the string cannot exceed 300 characters.
The string cannot contain more than 4 hashtags.
The string cannot contain more than 1 URL.
The string cannot consist of all capital letters.

Example Valid Text :

Developers trust #StackOverflow to help solve #coding problems and use Stack Overflow Careers to find job opportunities. Please visit https://stackoverflow.com/

Example Invalid Text :

Developers trust #StackOverflow to help solve #coding problems and use Stack Overflow Careers to find job opportunities. Please visit https://stackoverflow.com/ or https://stackoverflow.com/company/about

Invalid string above because there are containing two URL.

Any help would be appreciated and thank you very much :)

@derek-朕會功夫 you can see on example Valid / Invalid string above... — Peter Chimp
– Peter Chimp, Commented Aug 16, 2016 at 5:34

Math10 · Accepted Answer · 2016-08-16 07:32:50Z

3

I think this will help you

^(?!^([^#]*#[^#]*){5,}$)(?!(.*http(s{0,1}):\/\/){2,})(?=.*[a-z]).{0,300}$

(?!^([^#]*#[^#]*){5,}$) this will ensure that string should not contain more then 4 #
(?!(.*http(s{0,1}):\/\/){2,}) this will ensure that string should not contain more then 2 url
(?=.*[a-z]) this will ensure that string should contain at least 1 lower case letter
.{0,300} this will ensure that string should contain not more then 300 charter

answered Aug 16, 2016 at 7:32

Math10

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1 Comment

inf3rno Over a year ago

I would use str.length<=300 instead of regex by checking the length. I think trying to do everything in a single regex is anti-pattern.

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