import Foundation
let pattern = #"<assign.*?>"#
let regex = try! NSRegularExpression(pattern: pattern)
let testString = ##"""
<if VERSION="A1" || VERSION="A3" || VERSION="a2_%5C%22A3">
<assign CTA="blue">
<assign CTA2="green">
<assign TEXT1="Hello%3Cbr/%3EWorld">
<elseif attribute-name="A2">
<assign CTA="red">
<assign CTA2="yellow">
<assign CTA3="brown">
<assign TEXT1="Click%20%3Ca%20href='https://example.com'%20style='text-decoration:none;color:#000000;'%3Ehere%3C/a%3E">
</if>
// condition 2
<if FOO_BAR="A4" || baz-biz="A5">
<assign CTA="purple">
<assign CTA2="orange">
<assign TEXT1="Hi%20%3Cspan%20style='font-%20weight:bold;'%3EJohn%3C/span%3E" TEXT2="Hello%3Cbr/%3EWorld">
</if>
// condition 3
<if LANG="en_US">
<assign TITLE="English">
</if>
"""##
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let substitutionString = #"$&</assign>"#
let result = regex.stringByReplacingMatches(in: testString, range: stringRange, withTemplate: substitutionString)
print(result)
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression