Created
July 18, 2016 05:47
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simple regex
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import Foundation | |
/// See also | |
// http://qiita.com/tsuruchika/items/9ca9c4811e1f28b9417c | |
// http://qiita.com/moaible/items/85d80173bb8ed7f64b74 | |
// http://fromatom.hatenablog.com/entry/2015/07/15/192328 | |
public struct Regex { | |
private let pattern: String | |
private let internalExpression: NSRegularExpression | |
public init(_ pattern: String) { | |
self.pattern = pattern | |
do { | |
self.internalExpression = try NSRegularExpression(pattern: pattern, options: [.CaseInsensitive]) | |
} catch let error as NSError { | |
print(error.localizedDescription) | |
self.internalExpression = NSRegularExpression() | |
} | |
} | |
public func isMatch(input: String) -> Bool { | |
let matches = internalExpression.matchesInString(input, options: [], range: NSRange(location: 0, length: input.characters.count)) | |
return matches.count > 0 | |
} | |
public func matches(input: String) -> [String]? { | |
guard isMatch(input) else { return nil } | |
let matches = internalExpression.matchesInString(input, options: [], range: NSRange(location: 0, length: input.characters.count)) | |
return (0..<matches.count).reduce([]) { (acc: [String], n: Int) -> [String] in | |
acc + [(input as NSString).substringWithRange(matches[n].range)] | |
} | |
} | |
public func replace(input: String, after: String) -> String { | |
guard let matches = matches(input) else { return input } | |
return (0..<matches.count).reduce(input) { (acc: String, n: Int) -> String in | |
acc.stringByReplacingOccurrencesOfString(matches[n], withString: after, options: [], range: nil) | |
} | |
} | |
} | |
infix operator =~ {} | |
public func =~ (input: String, pattern: String) -> Bool { | |
return Regex(pattern).isMatch(input) | |
} |
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