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Re^2: add a character at the end of a string

by rsennat (Beadle)
on Dec 13, 2005 at 11:37 UTC ( [id://516289]=note: print w/replies, xml ) Need Help??


in reply to Re: add a character at the end of a string
in thread add a character at the end of a string

If I am right, /?$ means, the last slash in the string is replaced with /.

can you get me any links or nodes here to read more on perl substitution operator.

Thanks
rsennat

Replies are listed 'Best First'.
Re^3: add a character at the end of a string
by reasonablekeith (Deacon) on Dec 13, 2005 at 11:49 UTC
    ok, here goes...

    the / means just that, match a forward slash
    the ? then says that you don't have to match the preceding character, but it will try to if it's there
    Finally the $ ties the match to the very end of the string

    So, if your string ends with a / it will be matched, and replaced with another slash, with no net effect.

    However, if your script doesn't end with a slash, the whole substitution still matches because the slash was optional. In this case all we're matching is the 'end' of the string. The substitution then replaces this (zero-width) match with the new slash, which has the net effect in inserting the trailing slash.

    for futher reading I’d recommend ‘perldoc perlre’ and the excellent “Mastering Regular Expressions” published by O’Reilly (which is superb)

    ---
    my name's not Keith, and I'm not reasonable.

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