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#!/bin/bash
 
s="object smtp aaa smtp.asd.com server.smtp.com eq smtp"
sed -E -e ':a' -e 's/(^|[[:blank:]])smtp([[:blank:]]|$)/\125\2/g;ta' <<< "$s"

Success #stdin #stdout 0.01s 5520KB

stdin

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Standard input is empty

stdout

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object 25 aaa smtp.asd.com server.smtp.com eq 25

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Bash (bash 5.0.3)

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