import Foundation
let pattern = #"-?0+\.(0)+\b|\.0+\b|\b0+(?=\.\d*[1-9])|\b0+(?=[1-9]\d*\.)|(\.\d*?)0+\b"#
let regex = try! NSRegularExpression(pattern: pattern)
let testString = #"""
00.00
00002.0
3.00
-4.0
0.00
-0.00
0.03
2.01
0.001
-0.03
101
0.001
-0.03
.50
00.00
11.000000
"""#
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let substitutionString = #"$1$2"#
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