Why bash failed to match this pattern?

[Pan ruochen]

Hi All,

My current version of bash on cygwin failed to match this pattern:
*******************************
target=ar
if [[ "$target" =~ '^a' ]]; then
    echo Matched
else
    echo Unmatched
fi
*******************************

$bash --version
GNU bash, version 3.2.48(21)-release (i686-pc-cygwin)
Copyright (C) 2007 Free Software Foundation, Inc.

The older version of bash can match the same pattern before I upgrade cygwin.
What is the possible reason?

PRC
Jun 5, 2009

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