Question

Could anyone please help me writing a regex that I will use to validate a field (representing a digicode) in javascript that has to match the following criterias?

• needs to have 4 to 6 numbers (0 to 9)
• needs to have 1 * (star) or 1 # (sharp) either at the beginning or at the end

So the following works:

• 1234*
• *12345
• 56789#
• #456789

And the following doesn’t work:

• 1234
• 1*234
• *1234*
• *1234#
• 1234*#
• abcde

Many thanks!!

Answer 1

^(?:[*#]\d{4,6}|\d{4,6}[*#])$

See it here on Regexr

You may want to read some basics about regex: What absolutely every Programmer should know about regular expressions (my own blog post) everything I used here is covered there.