Global in Regex - State
Published on April 12, 2021← Back to tips
Did you know that the
global flag in regular expression has it’s own state?
Yes, after an expression test, it stores the index of the evaluated string, and continues from that index for further evaluations.
Here is what I mean 🔽
I’m trying to test a string with a simple regex.
Although, at first thought, it might seem like the expression would pass all the time, the second evaluation fails.
This is because, during the second evaluation, regex tests only the substring ” bar baz” as the previous test would have evaluated the first 3 characters.
I talk about the latest in frontend, along with my experience in building various (Indie) side-projects