regexp_union

⚙️ Build Dynamic Patterns with Regexp.union

Regexp.union safely joins multiple strings or regexes into one giant pattern, escaping as needed and or-ing alternatives. Ideal for dynamic lists.

keywords = ['if','else','while','for']
pattern = Regexp.union(keywords)
'if (condition)'.scan(pattern)  # => ["if"]

# Works with regexes too
dates = [/