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#!/bin/bash
 
read -p "Type smth: " text
if [[ $text =~ ^[[:alnum:]_]+$ ]]
then
    echo "ok"
else
    echo "not ok"
fi

Success #stdin #stdout 0.01s 5380KB

stdin

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Something

stdout

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ok

https://ideone.com/mWOfny

language:

Bash (bash 5.0.3)

created:

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