How to catch first occurence of [a-z]

ruby-talk
1

Hi,

Yes, I'm in learning mode and trying to see how I can change very first
occurrence of alpha char in string (or list), in my example first char
in string could be \s or \t, so I need to check for this.
It's multi line string, so I broke up it in list elements = line, and
now thinking how to process it.
What string function I can use?

list = multi_linestring.split(/\n/)
   ##then iterate thru each line { |ll| …???}

Thanks all

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2

Hi,

Yes, I'm in learning mode and trying to see how I can change very first
occurrence of alpha char in string (or list), in my example first char
in string could be \s or \t, so I need to check for this.
It's multi line string, so I broke up it in list elements = line, and
now thinking how to process it.
What string function I can use?

list = multi_linestring.split(/\n/)
  ##then iterate thru each line { |ll| ......???}

Thanks all

Writing an example is shorter than a long explanation. As
your learning experience, try to understand in detail how/why
this works ...

$ irb
1.9.3p0 :001 > " \t \t first line \nsecond line".split(/\n/).each do

line>

1.9.3p0 :002 > line.sub!(/[a-zA-Z]/, '*')
1.9.3p0 :003?> end
=> [" \t \t *irst line ", "*econd line"]

Hints:
* check the difference between sub , sub! , gsub , gsub!
* check character classes in regular expressions

HTH,

Peter

*** Available for a new project ***

Peter Vandenabeele
http://twitter.com/peter_v
http://rails.vandenabeele.com
http://coderwall.com/peter_v

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On Thu, Feb 9, 2012 at 6:07 AM, Mario Trento <dainova@yahoo.com> wrote:

3

Thanks, Peter !
for your example and resources.

That worked, I actually need now to capitalize each alpha char, trying
to edit your code and looks like I still need to use <capitalize>. I
can't do block [A-Z] in target sub.

dai

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