=~ Matches a regex against  a string and return the offset of the start of
the match or nil.

Below example can illustrate this:

##############################
#!/usr/bin/ruby

a = ['at', 'atx', 'xatx', 'xat', 'xyz']

puts "\nBefore delete_if array is : "
puts a.join("\n")

rgx = Regexp.new(/at/)

puts "\n"
a.each { | x | puts "offset of \'at\' in #{x} is #{rgx =~ x}" }

## delete_if
a.delete_if { | x | rgx =~ x }

puts "\nAfter delete_if array is : "
puts a.join(":")

#############################



----- Original Message ----- 
From: "Zach Dennis" <zdennis / mktec.com>
To: "ruby-talk ML" <ruby-talk / ruby-lang.org>
Sent: Wednesday, May 26, 2004 10:14 AM
Subject: delete_if woes


> I am having trouble with my delete_if block.
>
> prop_array.delete_if{ |p|
> (p=~/#{attr}/).to_i > 0; }
>
> and i have tried the longer version
>
> prop_array.delete_if{ |p|
> m = (p=~/#{attr}/).to_i
> m > 0; }
>
> and i have tried
>
> prop_array.delete_if{ |p|
> (p=~/#{attr}/) != nil }
>
> It deletes every element, even when m == 0 or m == nil. Any ideas? Thanks,
>
> Zach
> ---
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>