Shell Programming and Scripting

&& c=\\"$c"

"${v/$c/}"

&& c=\\"$c"

if [[ "$c" = '\' ]] || [[ "$c" = '?' ]]
then
    c='\'"$c"
fi

$ v="the quick brown fox"
$ c=" quick"
$ echo "${v/$c/}"
the brown fox

       ${parameter/pattern/string}
              Pattern substitution.  The pattern is expanded to produce a pat-
              tern  just  as in pathname expansion.  Parameter is expanded and
              the longest match of pattern against its value is replaced  with
              string.   If  pattern  begins with /, all matches of pattern are
              replaced  with  string.   Normally  only  the  first  match   is
              replaced.  If pattern begins with #, it must match at the begin-
              ning of the expanded value of parameter.  If pattern begins with
              %,  it must match at the end of the expanded value of parameter.
              If string is null, matches of pattern are deleted and the / fol-
              lowing pattern may be omitted.  If parameter is @ or *, the sub-
              stitution operation is applied to each positional  parameter  in
              turn,  and the expansion is the resultant list.  If parameter is
              an array variable subscripted with  @  or  *,  the  substitution
              operation  is  applied  to each member of the array in turn, and
              the expansion is the resultant list.