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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
//
// Tests for the code samples in the Regex documentation.
//
//===----------------------------------------------------------------------===//
import XCTest
import _StringProcessing
class RegexTests: XCTestCase {}
@available(SwiftStdlib 5.7, *)
extension RegexTests {
func testRegex() throws {
// 'keyAndValue' is created using a regex literal
let keyAndValue = /(.+?): (.+)/
// 'simpleDigits' is created from a pattern in a string
let simpleDigits = try Regex("[0-9]+")
let setting = "color: 161 103 230"
if setting.contains(simpleDigits) {
print("'\(setting)' contains some digits.")
}
// Prints "'color: 161 103 230' contains some digits."
if let match = setting.firstMatch(of: keyAndValue) {
print("Key: \(match.1)")
print("Value: \(match.2)")
}
// Key: color
// Value: 161 103 230
XCTAssertTrue(setting.contains(simpleDigits))
let match = try XCTUnwrap(setting.firstMatch(of: keyAndValue))
XCTAssertEqual(match.1, "color")
XCTAssertEqual(match.2, "161 103 230")
}
func testRegex_init() throws {
let simpleDigits = try Regex("[0-9]+")
// shouldn't throw
}
func testRegex_initStringAs() throws {
let keyAndValue = try Regex("(.+): (.+)", as: (Substring, Substring, Substring).self)
// shouldn't throw
}
func testRegex_initRegexAs() throws {
let dynamicRegex = try Regex("(.+?): (.+)")
if let stronglyTypedRegex = Regex(dynamicRegex, as: (Substring, Substring, Substring).self) {
print("Converted properly")
}
// Prints "Converted properly"
XCTAssertNotNil(Regex(dynamicRegex, as: (Substring, Substring, Substring).self))
}
func testRegex_initVerbatim() throws {
let adjectiveDesignator = Regex<Substring>(verbatim: "(adj.)")
print("awesome (adj.)".contains(adjectiveDesignator))
// Prints "true"
print("apple (n.)".contains(adjectiveDesignator))
// Prints "false"
XCTAssertTrue("awesome (adj.)".contains(adjectiveDesignator))
XCTAssertFalse("apple (n.)".contains(adjectiveDesignator))
}
func testRegex_containsCapture() throws {
let regex = try Regex("(?'key'.+?): (?'value'.+)")
regex.contains(captureNamed: "key") // true
regex.contains(captureNamed: "VALUE") // false
regex.contains(captureNamed: "1") // false
XCTAssertTrue(regex.contains(captureNamed: "key"))
XCTAssertFalse(regex.contains(captureNamed: "VALUE"))
XCTAssertFalse(regex.contains(captureNamed: "1"))
}
}
@available(SwiftStdlib 5.7, *)
extension RegexTests {
func testRegex_wholeMatchIn() throws {
let digits = /[0-9]+/
if let digitsMatch = try digits.wholeMatch(in: "2022") {
print(digitsMatch.0)
} else {
print("No match.")
}
// Prints "2022"
if let digitsMatch = try digits.wholeMatch(in: "The year is 2022.") {
print(digitsMatch.0)
} else {
print("No match.")
}
// Prints "No match."
XCTAssertEqual(try digits.wholeMatch(in: "2022")?.0, "2022")
XCTAssertNil(try digits.wholeMatch(in: "The year is 2022."))
}
func testRegex_prefixMatchIn() throws {
let titleCaseWord = /[A-Z][A-Za-z]+/
if let wordMatch = try titleCaseWord.prefixMatch(in: "Searching in a Regex") {
print(wordMatch.0)
} else {
print("No match.")
}
// Prints "Searching"
if let wordMatch = try titleCaseWord.prefixMatch(in: "title case word at the End") {
print(wordMatch.0)
} else {
print("No match.")
}
// Prints "No match."
XCTAssertEqual(try titleCaseWord.prefixMatch(in: "Searching in a Regex")?.0, "Searching")
XCTAssertNil(try titleCaseWord.prefixMatch(in: "title case word at the End"))
}
func testRegex_firstMatchIn() throws {
let digits = /[0-9]+/
if let digitsMatch = try digits.firstMatch(in: "The year is 2022; last year was 2021.") {
print(digitsMatch.0)
} else {
print("No match.")
}
// Prints "2022"
XCTAssertEqual(try digits.firstMatch(in: "The year is 2022; last year was 2021.")?.0, "2022")
}
}
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