The following code should do as desired.

(cat << EOF
tech -this is sample and ... 1.2 sample
bla bla bla test tech 1 one two
foo bar foo bar tech and [email protected] 0.1
bar bar bar foo foo tech 10.1.3
tech 7.5 and continue this line
sample_test one two tech 8.0
one two there tech 0.x *sample bla bla
www sample tech 1.3.x foo bar $foo #bar
foobar barbar bla bla tech 5.x
tech testtest 2.0.4x this is sample
EOF
) | grep $searchword |\
grep -o '\b[0-9x][0-9x]*\b\|\b[0-9][0-9]*\.[0-9x][0-9x]*\b\|\b[0-9][0-9]*\.[0-9][0-9]*\.[0-9x][0-9x]*\b' |\
sed "s/^/$searchword /"

will yield you

tech 1.2
tech 1
tech 0.1
tech 10.1.3
tech 7.5
tech 8.0
tech 0.x
tech 1.3.x
tech 5.x
tech 2.0.4x

at least with

• bash GNU bash, version 4.4.5(1)-release
• sed sed (GNU sed) 4.2.2
• grep grep (GNU grep) 2.27

I'd be glad it this answer helped you, or else you would consider being more explicit and more explaining in your question

The following code should do as desired.

searchword="tech"
(cat << EOF
tech -this is sample and ... 1.2 sample
bla bla bla test tech 1 one two
foo bar foo bar tech and [email protected] 0.1
bar bar bar foo foo tech 10.1.3
tech 7.5 and continue this line
sample_test one two tech 8.0
one two there tech 0.x *sample bla bla
www sample tech 1.3.x foo bar $foo #bar
foobar barbar bla bla tech 5.x
tech testtest 2.0.4x this is sample
EOF
) | grep $searchword |\
grep -o '\b[0-9x][0-9x]*\b\|\b[0-9][0-9]*\.[0-9x][0-9x]*\b\|\b[0-9][0-9]*\.[0-9][0-9]*\.[0-9x][0-9x]*\b' |\
sed "s/^/$searchword /"

will yield you

tech 1.2
tech 1
tech 0.1
tech 10.1.3
tech 7.5
tech 8.0
tech 0.x
tech 1.3.x
tech 5.x
tech 2.0.4x

at least with

• bash GNU bash, version 4.4.5(1)-release
• sed sed (GNU sed) 4.2.2
• grep grep (GNU grep) 2.27

I'd be glad it this answer helped you, or else you would consider being more explicit and more explaining in your question