sed whole word search and replace

How to replace whole words in string sed whole word search and replace

with sed in HP-UX (B.11.31)?

$ echo "bar embarassment" | sed "s/bar/no bar/g";

"\开发者_Go百科bbar\b" does not work
"\<bar\>" does not work
"[[:<:]]bar[[:>:]]" does not work

Try the -r option of sed with \b:

echo "bar embarassment" | sed -r "s/\bbar\b/no bar/g";

Tested on solaris, not hpux

echo "bar embarassment bar foobar bar" | 
sed -e 's/\([^[:graph:]]\)bar$/\1no bar/g'  \
    -e 's/\([^[:graph:]]\)bar\([^[:graph:]]\)/\1no bar\2/g' \
    -e 's/^bar\([^[:graph:]]\)/no bar\1/g'

emits

no bar embarassment no bar foobar no bar

if you are in vim, you can use this command:

:% s/\<old\>/new/g