Re: Oneliner with substring trimming and padding

Try eval (I've added needed additional parens around second matching group):

perl -pi -e 'substr($_,589,35) =~ s/(0*)((\w+)*)/$2.(' ' x length($1))/e if /^(.{589})(0{1,34})/' file.txt

Comment on Re: Oneliner with substring trimming and padding Download Code

Replies are listed 'Best First'.
Re^2: Oneliner with substring trimming and padding by Neighbour (Friar) on Jul 17, 2012 at 12:17 UTC
Ahh, `/e` makes all the difference...sneaky little bugger isn't explicitly documented in Modifiers, but is mentioned in Regexp Quote Like Operators (which I didn't look at until now). Thanks a lot :)	[reply] [d/l]
Re^3: Oneliner with substring trimming and padding by tobyink (Canon) on Jul 17, 2012 at 18:59 UTC
It's not documented in perlre because perlre is ridiculously pedantic. The `/e` doesn't modify the regular expression; it modifies the replacement text. `perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'`	[reply] [d/l]