Created
April 29, 2009 01:35
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## The pattern matcher in both the following will match either the single or double quote | |
## at the start of the src= attribute (this is what is available in $1 | |
## this regexp replacement works fine and will convert | |
## src="/foo/bar.png" | |
## to | |
## src="/RAILS_ROOT/public/foo/bar.png" | |
html_string.gsub!( /src=(["'])[\.\/]/ ) { |m| 'src=' + $1 + "#{RAILS_ROOT}/public/" } | |
## this regexp errors with the following error message | |
## TypeError: can't convert nil into String | |
## from (irb):84:in `+' | |
## from (irb):84 | |
## from (irb):84:in `gsub' | |
## from (irb):84 | |
html_string.gsub!( /src=(["'])\S+\?\d*\1/ ) { |s| s.split('?').first + $1 } | |
## the question is why can I do string concat with + $1 in the first regexp and | |
## why am I unable to do it in the second regexp where doing str + $1 throws the error?? | |
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