create a string from a pattern?

[Paul Rogers]

Im trying to come up with an easy way to generate a random string,
based on a supplied pattern, maybe something like:

String.from_pattern("\d\d\d@\w{3,5}.com") => "(e-mail address removed)"

Ive used a standard reg exp format here, but it doesnt matter if it
uses something else.
Any simple way to do this?

Thanks
Paul

 

[Robert Klemme]

Im trying to come up with an easy way to generate a random string,
based on a supplied pattern, maybe something like:

String.from_pattern("\d\d\d@\w{3,5}.com") => "(e-mail address removed)"

Ive used a standard reg exp format here, but it doesnt matter if it
uses something else.
Any simple way to do this?

Dunno whether you'd count this as simple:

"%d-%d{3}-%w{3,5}".gsub /%(.)(?:\{(\d+)(?:,(\d+))?\})?/ do |m|
t, mi, ma = $1, $2, $3

rep = case
when mi.nil?
1
when ma.nil?
mi.to_i
else
mi.to_i + rand(1 + ma.to_i - mi.to_i)
end

case t
when "d"
rep.to_enumtimes).inject("") {|s,| s << (?0 + rand(10)).chr}
when "w"
rep.to_enumtimes).inject("") {|s,| s << (?a + rand(1 + ?z -
?a)).chr}
else
# ignore
m
end
end


Kind regards

robert

 

[Paul Rogers]

Dunno whether you'd count this as simple:

"%d-%d{3}-%w{3,5}".gsub /%(.)(?:\{(\d+)(?:,(\d+))?\})?/ do |m|
t, mi, ma = $1, $2, $3

rep = case
when mi.nil?
1
when ma.nil?
mi.to_i
else
mi.to_i + rand(1 + ma.to_i - mi.to_i)
end

case t
when "d"
rep.to_enumtimes).inject("") {|s,| s << (?0 + rand(10)).chr}
when "w"
rep.to_enumtimes).inject("") {|s,| s << (?a + rand(1 + ?z -
?a)).chr}
else
# ignore
m
end
end

Kind regards

robert

its more elegant than I had, not sure about simpler ;-)
I had to do this ( just in case any one else tries it )
require 'enumerator'

Thanks!
Paul