I believe part of the problem are the slight syntax variations in different languages/environment. I've been writing regexes in Unix utilities (vim, grep/sed)

I believe part of the problem are the slight syntax variations in different languages/environment. I've been writing regexes in Unix utilities (vim, grep/sed) for the most part and when I found an answer on SO about a specific problem I was trying to solve, it was in JS. I barely understood what was being written to the point I stopped bothering "transcribing" it to UNIX syntax.