Question

How to convert lines in a multiline string starting with some "#" to start and end with "_" in Swift

Answer 1

import Foundation

var str = "###Word1 Word2\nWord3\nWord4 Word5 Word6\n##Word7\n#Word8 Word9\n"

// Define the regex pattern
let pattern = "#+(.*)\n"

// Create the regular expression
if let regex = try? NSRegularExpression(pattern: pattern, options: []) {
    // Perform the replacement
    let range = NSRange(location: 0, length: str.utf16.count)
    str = regex.stringByReplacingMatches(in: str, options: [], range: range, withTemplate: "_$1_\n")
}

print(str)


 
 
/*
run:

_Word1 Word2_
Word3
Word4 Word5 Word6
_Word7_
_Word8 Word9_
 
*/

 

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