Re: Having a problem with negative look behind assertion

[jethro]

in reply to Having a problem with negative look behind assertion

I would say only Athanasius has a correct answer yet, I see mistakes in the other answers. So I made sure and tested. This should work (and still uses only one regex):

if( $line =~ /^(?!fee).*[Bb]ar.*\.java/ )

This is a negative look-ahead fixed at the start of the line (with ^).

[Anonymous Monk]

I would say only Athanasius has a correct answer yet, I see mistakes in the other answers.

obviously wrong

[jethro]

If you mean to say your fourth answer is correct I beg to differ. !/fee/ aborts for "fee" anywhere in the string instead of only at the start like the OP wanted

UPDATE:

If you mean to say your third answer is correct I beg to differ. It expects a '/' after "fee". While this is always the case in the examples it is not what the OP said (although there is a chance that the OP misstated the problem)

[Anonymous Monk]

Gee, you say ^ is critical, is there an answer with ^, I wonder

[SirClive]

I wanted a single regexp if possible and this looks like it does the trick. Many thanks for the replies !