[Chicken-janitors] #1189: string-substitute \NUM syntax with preceding backslashes

[Chicken Trac]

#1189: string-substitute \NUM syntax with preceding backslashes
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 Reporter:  retroj      |       Owner:         
     Type:  defect      |      Status:  new    
 Priority:  major       |   Milestone:  someday
Component:  extensions  |     Version:  4.9.x  
 Keywords:              |  
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 I'm seeing an odd behavior with string-substitute.  I want to prefix
 commas in a string with backslashes, but found the following behavior:

 {{{
 > (use regex)

 > (string-substitute #\, "\\ \\0" "a,b")
 "a\\ ,b"

 > (string-substitute #\, "\\\\0" "a,b")
 "a\\\\0b"
 }}}

 The \NUM syntax in the substitution string worked as expected when
 preceded by a space, but not when preceded by another backslash (which was
 escaped).

 CHICKEN version 4.9.0.1
 regex version 1.0

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Ticket URL: <http://bugs.call-cc.org/ticket/1189>
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