UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36

Steps to reproduce the problem:
Copy the following commands in the browser console and execute them:
1.
var text = "https://test.example.com/examplefolder/index.html?param1=eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCIsInZlciI6MX0.eyJpc3MiOiJjb21wb25lbnRMaWNlbmNlU2VydmVyIiwibGljIjoiMGUxNzZmZDgtZjdjZS00OWQwLTg4NDEtMGExMzE3ODQ3YjI4Iiwic3ViIjoiNjQ5NDItMDYwMzQiLCJ0aWQiOjQxODExNiwiY2lkIjoxfQ.fq8ikVqrnpd_s86lz8H4c_GULO2EHdbT8bq4NRAy5fGyxtiSSZRHPL900FvKbbOOtuvdtplvNqG8tEmZH2WUwA&param2=0&param3=64942-06034&param4=1&param5=webshadow&param6=418116&param7=37913C&param8=0&param9=1&_=15289629061724455544455&INVALID_STRING_PART="
2. 
var regEx = /^(https?:)?(\/\/)?((([\däöüa-z-]+\.)+)([a-z]{2,12})|((([0-9]{1,3}\.){3})[0-9]{1,3})|(localhost))(:[0-9]{2,5})?(\/?)(\/[\wäöü\.-]+)*((#.*)|((\/?\?((##.+##)|([\wäöü#%\.-]+(=[\wäöü,#%\.\/-]+)?))+)(\&((##.+##)|([\wäöü,#%\.-]+(=[\wäöü,#%\.-]+)?)))*?)?)\/?$/gi
3. regEx.test(text)

What is the expected behavior?
regEx.test(text) should return false.

What went wrong?
Website freezes and in some cases the complete browser crashes.

Did this work before? N/A 

Chrome version: 67.0.3396.87  Channel: stable
OS Version: 10.0
Flash Version: 

Works as intended when the regex matches, with shorter strings the site does not crash but return takes a long time.