[ragel-users] Equivalent of PCRE \b

[Adrian Thurston]

I don't believe there are any purely regular solutions.

Best approximation I can think of is a condition that inspects p[0] and 
p[-1]. You'll need to ensure one char of context is always around though.

On 13-05-06 07:58 PM, Zach Levow wrote:
> Hi all,
> We're attempting to port a large collection of PCRE patterns into
> Ragel.  Most of the patterns are very straightforward, but a number of
> them use the \b directive (zero-width, non-word char followed by word
> char or vise-versa).  For example "my.*\btest" should match "my first
> test", but *not* "my shortest".  I'm sure we could handle this on a
> case-by-case basis, but I was wondering if anyone has an easy conversion.
> Thanks in advance!
> -Zach
>
>
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