[Boost-bugs] [Boost C++ Libraries] #3389: Replacement format operator to substitute sequential numbers

Subject: [Boost-bugs] [Boost C++ Libraries] #3389: Replacement format operator to substitute sequential numbers
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-09-02 09:52:37

#3389: Replacement format operator to substitute sequential numbers
-------------------------------------------------+--------------------------
 Reporter:  Keith MacDonald <keith@…>            |       Owner:  johnmaddock   
     Type:  Feature Requests                     |      Status:  new           
Milestone:  Boost 1.41.0                         |   Component:  regex         
  Version:  Boost 1.40.0                         |    Severity:  Not Applicable
 Keywords:  regex format syntax                  |  
-------------------------------------------------+--------------------------
 I'd like to suggest an enhancement to the Boost-Extended format string
 syntax.  Its syntax is one of:

 {{{
 \i
 \i(n)
 }}}

 The former substitutes sequential numbers, starting at 1, while the (n)
 modifier starts the sequence at value <n>.  For example, given this text:

 {{{
 #define FOO 52
 #define BAR 53
 }}}

 Searching for "[0-9]+" and replacing with "\i(100)" would result in:

 {{{
 #define FOO 100
 #define BAR 101
 }}}

 Each \i in the replacement format is treated independently, so searching
 for ". ." in the following text:

 {{{
 a b
 c d
 }}}

 and replacing it with "\i \i(20)" would result in:

 {{{
 1 20
 2 21
 }}}

 A useful variation would be the ability to specify the field width
 required, perhaps using "\i(n,w)", for leading spaces, and "\i(n,0w)" for
 leading zeroes.

 Thanks

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3389>
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