#!/bin/bash
s="####should be matched#### ignore the red text#########3
suvoo:
:suvoo:
 suvoo 
 suvoo:
suvoo'
suvoo\`
\`suvoo\`
"'"'"suvoo"'"'"
'suvoo:
 'suvoo "'"'"ghj
'suvoo
[suvoo~
{suvoo'
his name was \`suvoo'
his name is suvoo and he is 25
####shouldnt be matched####
asddsuvooaed
:suvo@abc:
suvooo
1suvoo
suvoo1:"

grep -E '(^|[[:space:]"'"'"'`(,:;<[{|~])suvoo([][:space:]"'"'"'),:;>`}|~]|$)' <<< "$s"