How can I combine multi regex together in javascript?
I have 3 regexes and want to combine them together.
const VALUE="qwer1234"
const pattern1 = /^.{5,20}/
const pattern2 = /[a-zA-Z]/
const pattern3 = /\d/
if(pattern1.test(VALUE) && pattern2.test(VALUE) && pattern3.test(VALUE)){
// do something...
}
I tried and could not solve it. thanks in advance.
You can write more complex patterns. Like:
const pattern = /^(?=.*?[a-zA-Z])(?=.*?[0-9])[a-zA-Z0-9]{5,20}$/
^ Start of the string
?=.*?[a-zA-Z] Atleast one letter
?=.*?[0-9] Atteast one digit
[a-zA-Z0-9]{5,20} Between 5 to 20 letters or digits. You can replace this part with .{5,20} if you want to allow any other characters too.
$ End of the string
I think what you were trying to match was a string with 5 to 20 lowercase and uppercase characters and digits. If so instead of writing it in different patterns you need to find a way to describe every condition in one pattern. I recommend using a tool like: https://regex101.com/ to speed up testing different patterns.
