From: Joel VanderWerf <vjoel@...>
Date: 2004-04-14T07:35:00+09:00
Subject: Re: New Ruby questions...

Jeff Massung wrote:
> 1. How can a regexp get the longer of two possibilities that are 
> ambiguous? For example, I need to be able to strip out register names:
> 
> registers = '(r0|r1|r2|r3...|r10|r11|r12...)'
> 
> In the regular expression, how can I get it to find r10 or r11 instead of 
> stopping at r1? I get the same problem with opcode mnemonics (like B 
> instead of BX or BL).

Is this what you want to do?

irb(main):001:0> registers = '(r0|r1|r2|r3...|r10|r11|r12...)'
=> "(r0|r1|r2|r3...|r10|r11|r12...)"
irb(main):002:0>
irb(main):003:0* registers.scan(/r\d+/)
=> ["r0", "r1", "r2", "r3", "r10", "r11", "r12"]