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#!/bin/bash
s='[:variable_one] == options[:variable_two]'
grep -o "\[:[^][]*]" <<< "$s"

Success #stdin #stdout 0.01s 5692KB

stdin

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Standard input is empty

stdout

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[:variable_one]
[:variable_two]

https://ideone.com/kFqPgu

language:

Bash (bash 5.0.3)

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