find all words ending in lex in a string with regex in swift

You can use the following regular expression to find all the words ending in "lex" in a string:

main.swift
let inputString = "Alex and Max saw a duplex near the annex"
let pattern = "\\b\\w*lex\\b"
let regex = try! NSRegularExpression(pattern: pattern)

let matches = regex.matches(in: inputString, range: NSRange(inputString.startIndex..., in: inputString))
let words = matches.map { String(inputString[Range($0.range, in: inputString)!]) }

print(words) // ["Alex", "duplex", "annex"]
380 chars
9 lines

In the above code, we define a string inputString and a regular expression pattern that matches any word that ends with "lex" using the word boundary character \b, zero or more word characters \w*, the characters "lex" literally, and another word boundary character \b.

We then create an instance of NSRegularExpression with the created pattern, and use the matches(in:range:) method to find all matches in the input string. Finally, we extract the matched words from the input string using the Range method and store them in an array words.