1 files changed, 70 insertions, 0 deletions
diff --git a/test/snippets/latin1-chars-in-regexp.js b/test/snippets/latin1-chars-in-regexp.js
new file mode 100644
index 000000000..e4d613f5e
--- /dev/null
+++ b/test/snippets/latin1-chars-in-regexp.js
@@ -0,0 +1,70 @@
+// original code:
+// var re_btou = new RegExp(
+//   [
+//     "[\xC0-\xDF][\x80-\xBF]",
+//     "[\xE0-\xEF][\x80-\xBF]{2}",
+//     "[\xF0-\xF7][\x80-\xBF]{3}",
+//   ].join("|"),
+//   "g"
+// );
+
+export var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
+export var re_btou = new RegExp(
+  [
+    "[\xC0-\xDF][\x80-\xBF]",
+    "[\xE0-\xEF][\x80-\xBF]{2}",
+    "[\xF0-\xF7][\x80-\xBF]{3}",
+  ].join("|"),
+  "g"
+);
+
+const encoder = new TextEncoder();
+const realLines = [
+  "[\xC0-\xDF][\x80-\xBF]",
+  "[\xE0-\xEF][\x80-\xBF]{2}",
+  "[\xF0-\xF7][\x80-\xBF]{3}",
+];
+const real = realLines.map((input) => Array.from(encoder.encode(input)));
+
+const expected = [
+  [91, 195, 128, 45, 195, 159, 93, 91, 194, 128, 45, 194, 191, 93],
+  [
+    91, 195, 160, 45, 195, 175, 93, 91, 194, 128, 45, 194, 191, 93, 123, 50,
+    125,
+  ],
+  [
+    91, 195, 176, 45, 195, 183, 93, 91, 194, 128, 45, 194, 191, 93, 123, 51,
+    125,
+  ],
+];
+
+const newlinePreserved = `\n`;
+
+export function test() {
+  if (
+    !real.every((point, i) => point.every((val, j) => val === expected[i][j]))
+  ) {
+    throw new Error(
+      `test failed
+${JSON.stringify({ expected, real }, null, 2)}`
+    );
+  }
+
+  if (newlinePreserved.length !== 1 || newlinePreserved.charCodeAt(0) !== 10) {
+    throw new Error("Newline was not preserved");
+  }
+
+  const decoder = new TextDecoder("utf8");
+  if (
+    !realLines.every(
+      (line, i) => decoder.decode(Uint8Array.from(expected[i])) === line
+    )
+  ) {
+    throw new Error(
+      `test failed. Lines did not match.
+${JSON.stringify({ expected, real }, null, 2)}`
+    );
+  }
+
+  testDone(import.meta.url);
+}