Question

I want a regex that checks the following things:

1. The string starts with an +
2. After the ‘+’ only numbers can occur
3. There should be atleast 4 numbers after the +

Does anyone know how to make this?

Answer 1

/^+\d{4,}$/

will meet your requirements.

^ is the anchor for start fo the string

\d is a digit

{4,} says at least 4 of the preceding expression (here the \d). you can add a maximum if needed like {4,20} would allow at least 4 and at most 20 characters.

$ is the anchor for the end of the string