Question

I have a regular expression

^[\\p{L}\\d._]*\\p{L}+[\\p{L}\\d._]*$ 

which accepts alphabets,alphanumerics and special characters like . and _ . Can we make this regular expression accept total minimum length of three(including characters,alphanumerics etc) and maximum of 15(including characters,alphanumerics etc)

Thanks,
Balaji.

Answer 1

To add an extra check that the total length is between 3 and 15 you can use lookahead:

(?=^.{3,15}$)^[\\p{L}\\d._]*\\p{L}+[\\p{L}\\d._]*$ 

A group of the form (?=<regex>) checks if <regex> matches from the current position, but doesn’t move the marker forward.