JavaScript Odd str.split behaviour, str.match works fine

[Alef]

I am trying to split a string on a matched regular expression but its not behaving as intended. It splits in weird spots. While if use the str.match function with the same regular expression it finds all the things I want to split on.  So I am kind of baffled to whats going on. 

 

Trying to split using following expression. This matches for example "74017 - SOFE 3850U", "74019 - SOFE 3850U", "74020 - SOFE 3850U" ........

/([0-9]{5})+\s+-+\s+([A-Z]{3,4})+\s+([0-9]{4})+U/g

 

 

 

Sample of the data I am attempting to split on using the regular expression above

74017 - SOFE 3850U,Lecture,11:10 am,12:30 pm,T,Lecture,11:10 am,12:30 pm,R,Lecture,74019 - SOFE 3850U,Laboratory,12:40 pm,3:30 pm,W,Laboratory,12:40 pm,3:30 pm,W,Laboratory,12:40 pm,3:30 pm,W,Laboratory,12:40 pm,3:30 pm,W,Laboratory,12:40 pm,3:30 pm,W,Laboratory,12:40 pm,3:30 pm,W,Laboratory,74020 - SOFE 3850U,Laboratory,12:40 pm,3:30 pm,W,Laboratory,12:40 pm,3:30 pm,W,Laboratory,12:40 pm,3:30 pm,W,Laboratory,12:40 pm,3:30 pm,W,Laboratory,12:40 pm,3:30 pm,W,Laboratory,12:40 pm,3:30 pm,W,Laboratory,74021 - SOFE 3850U,Laboratory,12:40 pm,3:30 pm,T,Laboratory,12:40 pm,3:30 pm,T,Laboratory,12:40 pm,3:30 pm,T,Laboratory,12:40 pm,3:30 pm,T,Laboratory,12:40 pm,3:30 pm,T,Laboratory,12:40 pm,3:30 pm,T,Laboratory,74283 - SOFE 3850U,Laboratory,12:40 pm,3:30 pm,T,Laboratory,12:40 pm,3:30 pm,T,Laboratory,12:40 pm,3:30 pm,T,Laboratory,12:40 pm,3:30 pm,T,Laboratory,12:40 pm,3:30 pm,T,Laboratory,12:40 pm,3:30 pm,T,Laboratory,74285 - SOFE 3850U,Laboratory,12:40 pm,3:30 pm,R,Laboratory,12:40 pm,3:30 pm,R,Laboratory,12:40 pm,3:30 pm,R,Laboratory,12:40 pm,3:30 pm,R,Laboratory,12:40 pm,3:30 pm,R,Laboratory,12:40 pm,3:30 pm,R,Laboratory,74022 - SOFE 3850U,Tutorial,2:10 pm,3:30 pm,M,Tutorial,74023 - SOFE 3850U,Tutorial,8:10 am,9:30 am,M,Tutorial

 

 

 

EDIT: Found a suboptimal solution by using str.replace first then str.split. I was able to do "somestring".replace(regex, "^") then split on "^" . Still want to know why the split function inst working as intended though.

 

[Mira Yurizaki]

The parenthesis in your regular expression is creating separate capture groups that split is using. If you get rid of them then it appears to work as intended.

[0-9]{5}\s+-+\s+[A-Z]{3,4}\s+[0-9]{4}U/g

I was using https://regex101.com/ to verify this.

[Alef]

9 minutes ago, Mira Yurizaki said:

The parenthesis in your regular expression is creating separate capture groups that split is using. If you get rid of them then it appears to work as intended.

[0-9]{5}\s+-+\s+[A-Z]{3,4}\s+[0-9]{4}U/g

I was using https://regex101.com/ to verify this.

 

Wow, I was so close I tried removing "+" from the expression thinking it might affect it, but never did try removing brackets. Thank you for your help