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Add tests for line start/end word boundary diffs #616

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Dec 2, 2022
Merged

Add tests for line start/end word boundary diffs #616

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13 changes: 13 additions & 0 deletions Tests/RegexTests/MatchTests.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -1517,6 +1517,19 @@ extension RegexTests {
(" 123", "23"),
("123 456", "23"))

let defaultBoundaryRegex = try Regex(#"\b.{3}X.{3}\b"#)
// Default word boundaries match at the start/end of a string/line.
XCTAssertNotNil(try defaultBoundaryRegex.firstMatch(in: "---X---"))
XCTAssertNotNil(try defaultBoundaryRegex.firstMatch(in: "abc\n---X---\ndef"))

let simpleBoundaryRegex = defaultBoundaryRegex.wordBoundaryKind(.simple)
// Simple word boundaries match only when the adjacent position matches \w.
XCTAssertNil(try simpleBoundaryRegex.firstMatch(in: "---X---"))
XCTAssertNil(try simpleBoundaryRegex.firstMatch(in: "abc\n---X---\ndef"))

XCTAssertNotNil(try simpleBoundaryRegex.firstMatch(in: "x--X--x"))
XCTAssertNotNil(try simpleBoundaryRegex.firstMatch(in: "abc\nx--X--x\ndef"))

// \G and \K
let regex = try Regex(#"\Gab"#, as: Substring.self)
XCTAssertEqual("abab".matches(of: regex).map(\.output), ["ab", "ab"])
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