You are completely right This would improve a bit the performance.

Thanks for the tip! :)

I struggled similarly until SO likewise rescued me from frustration. It looks like lastIndex can increment by 4 since the earliest overlaps start at the last two characters of six character sequences.

I'm glad you liked it! :)

Actually I had to struggle a bit until using that trick. I read all the documentation I could find about regexes and finally found something similar in StackOverflow. Regexes are so powerful! :)

hehe thanks, getting better at regex :)

Thanks for your info- it's submitted again;-)!

For the last test: say == ''.