(polyfill) replace (?<) lookbehind group with custom split function

src/buildPronoun.ts

@@ -66,6 +66,29 @@ const buildPronounFromTemplate = (key: string, template: PronounTemplate): Prono
     );
 };
 
+const splitSlashes = (path: string): string[] => {
+    const chunks = [];
+    let escape = false;
+    let currentChunk = '';
+    for (const character of path) {
+        if (escape) {
+            currentChunk += `\`${character}`;
+            escape = false;
+        } else {
+            if (character === '`') {
+                escape = true;
+            } else if (character === '/') {
+                chunks.push(currentChunk);
+                currentChunk = '';
+            } else {
+                currentChunk += character;
+            }
+        }
+    }
+    chunks.push(currentChunk);
+    return chunks;
+};
+
 const isModifier = (chunk: string, key: string, translator: Translator): boolean => {
     // use both locale and base translations to ensure backwards compatibility if key gets translated
     return chunk === `:${translator.translate(key)}` || chunk === `:${translator.get(key, false, true)}`;
@@ -83,7 +106,7 @@ const extractModifierValue = (chunk: string, key: string, translator: Translator
 };
 
 const buildPronounFromSlashes = (config: Config, path: string, translator: Translator): Pronoun | null => {
-    const chunks = path.split(/(?<!`)\//);
+    const chunks = splitSlashes(path);
     let plural = false;
     let pluralHonorific = false;
     let description = '';