Regexpr with gsub

ruby-talk
1

Hi,
I'm trying to get code to replace first alpha char for Cap, and can't
get how it works, in case#1 dot represent any char including space and
it works fine, but when I tried to do first "a" it doesn't catch
anything, I played with [a-z] and other syntax but still have this
problem.
Can anybody point my brain into right place, why it doesn't work?

ruby 1.9.3p0 (2011-10-30) [i386-mingw32]
irb(main):002:0> puts ss
sabaka ryba
=> nil
irb(main):003:0> puts ss.gsub(/^./,"A") # case #1
Asabaka ryba
irb(main):005:0> puts ss.gsub(/^a/,"A") # case #2
sabaka ryba
irb(main):005:0> puts ss.gsub(/^[a-z]/,/[A-Z]/) # case #3
sabaka ryba

Best
Dai

···

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2

irb(main):002:0> "aaa aaa".gsub /\ba/, 'A'
=> "Aaa Aaa"

This won't work for the general case though. You might rather want to
do something like

irb(main):003:0> "aaa aaa".gsub(/\w+/) {|m| m.capitalize}
=> "Aaa Aaa"

Kind regards

robert

···

On Wed, Feb 8, 2012 at 10:32 AM, Vic Trento <dainova@yahoo.com> wrote:

Hi,
I'm trying to get code to replace first alpha char for Cap, and can't
get how it works, in case#1 dot represent any char including space and
it works fine, but when I tried to do first "a" it doesn't catch
anything, I played with [a-z] and other syntax but still have this
problem.
Can anybody point my brain into right place, why it doesn't work?

ruby 1.9.3p0 (2011-10-30) [i386-mingw32]
irb(main):002:0> puts ss
sabaka ryba
=> nil
irb(main):003:0> puts ss.gsub(/^./,"A") # case #1
Asabaka ryba
irb(main):005:0> puts ss.gsub(/^a/,"A") # case #2
sabaka ryba
irb(main):005:0> puts ss.gsub(/^[a-z]/,/[A-Z]/) # case #3
sabaka ryba

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http://blog.rubybestpractices.com/

3

Robert Klemme wrote in post #1044728:

This won't work for the general case though. You might rather want to
do something like

irb(main):003:0> "aaa aaa".gsub(/\w+/) {|m| m.capitalize}
=> "Aaa Aaa"

Thanks, Robert !
I need to cap only first alpha char on each line and there is leading
space, so need to check it bit more.

Dai

···

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