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#!/bin/bash
s='object.word_to_extract123'
grep -oP '(?<=object\.)\w+' <<< "$s"
sed -nE 's/.*object\.([[:alnum:]_]+).*/\1/p' <<< "$s"

Success #stdin #stdout 0.01s 5432KB

stdin

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Standard input is empty

stdout

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word_to_extract123
word_to_extract123

https://ideone.com/ESenne

language:

Bash (bash 5.0.3)

created:

visibility:

public

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