[TxMt] regex question
throw-away-1 at macromates.com
Wed Feb 22 09:35:50 UTC 2006
On 22/2/2006, at 9:21, Charilaos Skiadas wrote:
>> But when I run the command none of the tabs or newlines I've
>> specified in the replace section of the command are applied to the
>> text in question [...]
> 1) It searches each line separately, in which case it won't match
> the multiline search you are performing
That’s exactly it! :)
The -p switch puts a loop around the perl code, which execute that
code for each line in the input (stdin).
So: perl -pe 'foo' translates to:
for each line in the input
print result of running “foo” on line
Loops and such are generally easier in Ruby, so instead try:
ruby -e '
So what’s s/«regexp»/«replacement»/ in Perl is sub(/«pattern»/,
«replacement») in Ruby. And instead of adding ‘g’ as option to make
it “global”, we use gsub.
In addition, in Ruby we have to use \1 instead of $1 etc.
In Perl the s/«regexp»/«replacement»/ runs on the $_ variable (which
is the current line, when used with the -p switch). Ruby has a
similar feature (both -p and $_ as “accumulator” reguster), but in
the above we explicitly call gsub on all we read from STDIN, instead
of doing it line-by-line.
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