Bug #10022: Inconsistent behavior of gsub replacement

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0]
• Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN

[franklsf95 (Frank Luan)]

In the following code, the two gsub's yield different results. ([[https://gist.github.com/franklsf95/6c0f8938f28706b5644d]])

ver = 9999
str = "\t<key>CFBundleDevelopmentRegion</key>\n\t<string>en</string>\n\t<key>CFBundleVersion</key>\n\t<string>0.1.190</string>\n\t<key>AppID</key>\n\t<string>000000000000000</string>"
puts str.gsub /(CFBundleVersion<\/key>\n\t.*\.).*(<\/string>)/, "#{$1}#{ver}#{$2}"
puts '--------'
puts str.gsub /(CFBundleVersion<\/key>\n\t.*\.).*(<\/string>)/, "#{$1}#{ver}#{$2}"

My running result is:

<key>CFBundleDevelopmentRegion</key>
<string>en</string>
<key>9999
<key>AppID</key>
<string>000000000000000</string>
--------
<key>CFBundleDevelopmentRegion</key>
<string>en</string>
<key>CFBundleVersion</key>
<string>0.1.9999</string>
<key>AppID</key>
<string>000000000000000</string>

...which is strangely inconsistent.

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)
• Status changed from Open to Rejected

The second argument is evaluated before calling gsub method.
Call it with a block:

puts str.gsub(/(CFBundleVersion<\/key>\n\t.*\.).*(<\/string>)/) {"#{$1}#{ver}#{$2}"}