Regex Practical Examples
Real-world regex use cases
Validation
^[a-zA-Z0-9]{6,}$
# username (6+ alphanumeric chars)
^(?=.*[A-Z])(?=.*[a-z])(?=.*\d).{8,}$
# strong passwordExtraction
\d+
# extract all numbers
#([a-fA-F0-9]{6})
# extract hex color codesReplacement
(\w+)\s+(\w+) → $2 $1
# swap first two wordsURL Parts
^(https?://)([^/]+)(/.*)?$
# captures protocol, domain, pathFile Extensions
\.(jpg|jpeg|png|gif)$
# matches image filesRemove Tags
<[^>]*>
# matches HTML tags