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  Regexp and back reference  (Read 1334 times)
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Offline Bombadil

Senior Devvie

« Posted 2005-06-14 14:52:28 »

There's some difference between Java's regexp plus back reference and the GAWK regexp methods.

I would like to, for example, cut the pure filename out of a string: no path and no ending. (I know the File class and its handy methods but it's for strings only and a general question).
Of course with several lines of code it's well possible. :-)

However is it also possible with the String.replaceFirst(regexp, replace) method or a one-liner with Pattern.compile("regexp").matcher(string).etc ?

With GAWK and its powerful gensub I'd do something like this:
  $0 = "c:/Path/Filename.png";
  gensub(/.+\\(.+)\.png$/, "\\1", "g")
in order to get "Filename".

In Java I couldn't figure out how to use the back reference in the replacement argument. Is it just for the regexp argument?

I'm just asking because I'm used to the one-liner of GAWK.
Offline Bombadil

Senior Devvie

« Reply #1 - Posted 2005-06-15 08:29:48 »

Well, then two replaceFirst in one line... Unlike AWK we're OO.

thestring.replaceFirst(".+/", "").replaceFirst("\\.png", "")
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