chazmeyers.com/blog


Double escaping backslashes in ruby.

Posted in ruby by chazmeyers on the July 11th, 2007

If you have a string that looks like:
\

and you want it to look like:
\\

in ruby, you have to do the following:

Code (ruby)
  1.  
  2. irb(main):070:0> str = "\\"
  3. => "\\"
  4. irb(main):071:0> puts str
  5. \
  6. => nil
  7. irb(main):073:0> puts str.gsub("\\", "\\\\\\\\")
  8. \\
  9. => nil
  10.  

In Ruby, you can use perl-style regular expression numbered group references in replacement strings (ie \\1 = the first captured group of the regexp). So, to make a literal backslash in gsub, you need “\\\\”. And to make the second one, you need “\\\\\\\\”.

Slightly better YAMLization of Ruby Exceptions.

Posted in Uncategorized, ruby by chazmeyers on the July 10th, 2007

Installing eventmachine on older FreeBSD’s.

Posted in Uncategorized, ruby, RubyOnRails by chazmeyers on the July 5th, 2007

6 < 4.8?

Posted in ruby, General Programming Topics by chazmeyers on the February 28th, 2007

Leaky Abstractions.

Posted in RubyOnRails, General Programming Topics by chazmeyers on the February 6th, 2007