CODEWITHSUNDEEP
ruby-on-railsrubyregexruby-on-rails-3ruby-on-rails-3.2
daniel barrera
daniel barrera

Reputation: 367

Create regular expression in ruby on rails for validate username

I need create a regular expression in ruby on rails for validate the user name following this rules:

 1)- The user name accept only lowercase letters, numbers,dashes and underscores
 2)- The first character must be a lowercase letter
 3)- The username have as minimum 6 characters and 30 characters as maximun

I thought some like this, but I'm not very sure

  /^ ([a-z][a-z\_-0-9]+){6,30}  $/

Upvotes: 0

Views: 206

Answers (1)

Madbreaks
Madbreaks

Reputation: 19539

I'd suggest the following:

/^[a-z][a-z\-0-9_]{5,29}$/

I'll break it down:

  • ^[a-z] - the sequence starts with (^) a lowercase character
  • [a-z\-0-9_] - any of the chars in that group
  • {5,29} - between 5 and 29 (30 max, minus the one at the start of the sequence) of the previous set of chars
  • $ the end of the sequence

You mentioned character classes - sure, you can use them. I typically don't because they're not as portable (someone may chime in and prove me wrong here) and I don't think they're as easy to understand, simply because I tend to forget which ones are which. YMMV

Upvotes: 3

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