Regex In Bash: Pattern Matching

Regular expressions match patterns. In bash. With =~.

Here's the thing: Regex matches patterns. Learn it. Use it.

=~ Operator

if [[ "hello" =~ ^h ]]; then
    echo "Matches"
fi

My take: =~ matches regex. Use it.

Common Patterns

Email Validation

if [[ "$email" =~ ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$ ]]; then
    echo "Valid email"
fi

What's Next?

Now that you understand regex, you can match patterns. Or review Advanced Features to reinforce.

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Personal note: Regex seemed complex at first. Then I learned basics. Now I use it when needed. It's powerful. Learn it.