Online regex tools jsconsole.com vs rubular.com

Have to do lots of regex matching for string, these three websites are great if you are stuck.

https://jsconsole.com/
https://rubular.com/ can show others your regex: https://rubular.com/r/QEcbDCJSDCiBMb
https://regexr.com/

jsconsole.com

https://jsconsole.com/

"covid-19".replaceAll(/([a-zA-Z]+)-([0-9]+)/g, "$1 $2")
covid 19

"my number is 1234543 234k-kk1-234 234k23412kj531-24 and 12.3.4.5643.3 and 123.456".replaceAll(/([0-9]+([^-][0-9]+)?)/g, " $1 ")

my number is  1234543 234 k-kk 1 - 234 234 k 23412 kj 531 - 24  and  12.3 . 4.5643 . 3  and  123.456 

"abc(123)".replaceAll(/\(.+\)/g, '')
abc
"PTive test to try. had'PT testing caPTive PT and PT.".replaceAll(/(([^'])(\bPT\.|\bPT\b))|(^\bPT\.|^\bPT\b)/g, ' p t ')
PTive test to try. had'PT testing caPTive p t  and p t