pattern substitution expands "~" even in quoted variables

[Lars Wendler]

Configuration Information 
[Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: x86_64-pc-linux-gnu-gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I. -I./include -I. -I./include -I./lib  
-DDEFAULT_PATH_VALUE='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'
 -DSTANDARD_UTILS_PATH='/bin:/usr/bin:/sbin:/usr/sbin' 
-DSYS_BASHRC='/etc/bash/bashrc' -DSYS_BASH_LOGOUT='/etc/bash/bash_logout' 
-DNON_INTERACTIVE_LOGIN_SHELLS -DSSH_SOURCE_BASHRC -march=barcelona 
-mtune=barcelona -O2 -pipe
uname output: Linux shanghai 3.12.13 #2 SMP PREEMPT Wed Mar 5 17:26:09 CET 2014 
x86_64 Quad-Core AMD Opteron(tm) Processor 2389 AuthenticAMD GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.3
Patch Level: 0
Release Status: release

Description:

bash-4.3 seems to expand a "~" (tilde character) with full homepath in a 
pattern substitution even when the variable is embraced by double quotes.

Repeat-By:

replace_with_tilde() { P="foo_bar" ; echo ${P/_/~} ;  echo "${P/_/~}" ; }


bash-4.2.45:

~% replace_with_tilde
foo/home/polynomial-cbar
foo~bar


bash-4.3.0:

~% replace_with_tilde
foo/home/polynomial-cbar
foo/home/polynomial-cbar

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