regex ruby valid for letters-digits and digits

Question

I have 2 regexps in ruby. The first regex is for letters and digits something like:

letter_digits = /^([0-9]*[a-zA-Z][a-zA-Z0-9]*)$/

With this regex if I write only digits 564521 does not match!

However I have this regex for only digits:

only_digits = /^([0-9])*$/

But with this regex if I write s45xo does not match!

I need only 1 regex valid for both letters/digits and digits.

Danil Speransky · Accepted Answer · 2012-07-28 12:20:17Z

5

Try: letter_digits = /^[0-9a-zA-Z]*$/

Your first regexp /^([0-9]*[a-zA-Z][a-zA-Z0-9]*)$/ says that there should be digits (0 or more), then letter (1), then digits or letters (0 or more).

My advise is to read something about regexp, for example tutorial

edited Jul 28, 2012 at 12:20

answered Jul 28, 2012 at 12:12

Danil Speransky

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2 Comments

pguardiario Over a year ago

No because "this shouldn't\nmatch" =~ /^[0-9a-zA-Z]*$/

pguardiario Over a year ago

That string shouldn't match the regex.

pguardiario · Accepted Answer · 2012-07-28 13:01:59Z

2

The simplest regex is:

/\A[a-z\d]*\Z/i

answered Jul 28, 2012 at 13:01

pguardiario

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