Swift 用函数实现正则表达式的库 SwiftVerbalExpressions

SwiftVerbalExpressions 是一个Swift库，可以通过函数的方式实现复杂的正则表达式功能。从JavaScript的版本JSVerbalExpressions移植。

这里有几个简单的例子来了解VerbalExpressions的工作原理：

检查网址是否有效

// Create an example of how to test for correctly formed URLs
let tester = VerEx()
    .startOfLine()
    .then("http")
    .maybe("s")
    .then("://")
    .maybe("www")
    .anythingBut(" ")
    .endOfLine()

// Create an example URL
let testMe = "https://www.google.com"

// Use test() method
if tester.test(testMe) {
    println("We have a correct URL") // This output will fire
}
else {
    println("The URL is incorrect")
}

// Use =~ operator
if testMe =~ tester {
    println("We have a correct URL") // This output will fire
}
else {
    println("The URL is incorrect")
}

println(tester) // Outputs the actual expression used: "^(?:http)(?:s)?(?::\/\/)(?:www)?(?:[^ ]*)$"

let replaceMe = "Replace bird with a duck"

// Create an expression that seeks for word "bird"
let verEx = VerEx().find("bird")

// Execute the expression like a normal RegExp object
let result = verEx.replace(replaceMe, with: "duck")

println(result) // Outputs "Replace duck with a duck"

let result2 = VerEx().find("red").replace("We have a red house", with: "blue")

println(result2) // Outputs "We have a blue house"

可以查看JavaScript版本的API文档。