caruccio/bash-regex.md

## bash-regex.md

      
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              bash-regex.md
            
          
    In bash you can use [[ pattern =~ regex ]] to match on a conditional:
if [[ "hello world" =~ ^hell ]]; then
  echo Match
else
  echo No match
fi
The syntax is simple: [[ INPUT =~ REGEX ]].
Grouping match (REGEX)can be found in the array variable BASH_REMATCH:
URL=https://example.com

if [[ "$URL" =~ ^https?://([^/]+) ]]; then
  FOUND_DOMAIN=${BASH_REMATCH[1]}
  echo "Domain: $FOUND_DOMAIN"
else
  echo "Invalid URL"
fi