From: ts <decoux@...>
Date: 2005-01-27T19:20:32+09:00
Subject: Re: RegEx help (small)

>>>>> "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



Guy Decoux