Ruby，检查字符串是否都是有效的十六进制字符？

Question

I have to check if a 4 character string is all valid hex, I found another question which demonstrates exactly what I want to do but it's Java: Regex to check string contains only Hex characters

How can I accomplish this?

I read the ruby docs for Regular expressions, but I don't understand how to return a true or false based on this match?

Answer 1

In ruby regex \\h matches a hex digit and \\H matches a non-hex digit.

So !str[/\\H/] is what you're looking for.

Answer 2

if str =~ /^[0-9A-F]+$/

does the trick. If you want case insensitive then:

str =~ /^[0-9A-F]+$/i

Answer 3

pattern = /^[[:xdigit:]]+$/

And then just check:

if  pattern === your_string
if /^[[:xdigit:]]+$/ === your_string

or with

if your_string.match?(/^[[:xdigit:]]+$/)