From: Robert Klemme <bob.news@...>
Date: 2005-01-27T19:35:56+09:00
Subject: Re: RegEx help (small)


"ts" <decoux@moulon.inra.fr> schrieb im Newsbeitrag
news:200501271020.j0RAKGL04736@moulon.inra.fr...
> >>>>> "B" == Bil Kleb <Bil.Kleb@NASA.Gov> writes:
>
> B>    gsub( /(?!\w)'(.*?)'/, '`\1\'' )
>
>  (?!) is a zero-width negative look-ahead
>
>
> B>    assert_equal( "isn't fool'd", "isn't fool'd".to_tex )
>
>  When the regexp engine is at this position (just before ')
>
>  "isn't fool'd"
>
>      ^
>      |
>
>  * it look if it don't have a word character (\w) : this is true because
the
>  first next character is '
>
>  * then it look if it has ' : it's true and it match

These seem to work:

>> class String
>>   def to_tex
>>    gsub( /(?:\A|(?![\w']))'(.*?)'/, '`\\1\'' )
>>   end
>> end
=> nil
>> "'single quotation'".to_tex
=> "`single quotation'"

>> class String
>>   def to_tex
>>    gsub( /'((?:[^\\']|\\.)*)'/, '`\\1\'' )
>>   end
>> end
=> nil
>> "'single quotation'".to_tex
=> "`single quotation'"

But I dunno whether they fix all of your problems.

Kind regards

    robert