From: Russell Fulton <r.fulton@...>
Date: 2007-08-02T07:04:15+09:00
Subject: oddity with RegExp

I'm clearly missing something!  I have a log analysis application that
is written in Ruby and which uses REs to decide how to process log
records.

I entered a pattern into one of my rules and it always failed to match
so I fired up irb and set about reducing the pattern to something
minimal:

[rful011@pateke selms-svn]$ irb
irb(main):001:0> a = 'NT AUTHORITY\SYSTEM'
=> "NT AUTHORITY\\SYSTEM"
irb(main):004:0> a =~ /AUTHORITY/
=> 3
irb(main):005:0> a =~ /NT AUTHORITY/
=> 0
irb(main):006:0> a =~ / AUTHORITY/
=> 2
irb(main):007:0> a =~ /^NT /
=> 0
irb(main):008:0> a =~ /NT /
=> 0
irb(main):009:0> a =~ /NT/
=> 0
irb(main):010:0> a =~ /N/
=> 0
irb(main):011:0> a =~ /T/
=> 1


Is the '\' in the string upsetting things?

Cheers and thanks,

Russell
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