fix: when there is regex flags, the regex is not interpreted correctly

src/match-pattern.ts

@@ -36,16 +36,22 @@ export function match<T, U = never>(value: any, patterns: MatchPatterns<T, U>):
     } else if (isNone(value) && patterns.None !== undefined) {
         return patterns.None as T;
     }
-    
+
     for (const p in patterns) {
 
         if (p === "Some" || p === "None") continue;
 
         const patternKey = String(p);
         const isRange = patternKey.includes("..=");
         const isOr = patternKey.includes("|");
-        const isRegex = patternKey.startsWith("/") && patternKey.endsWith("/");
-
+
+        const lastSlashIndex = patternKey.lastIndexOf("/");
+        const foundFlags = patternKey.slice(lastSlashIndex + 1).split("");
+
+        const isRegex = !!foundFlags.length
+            ? patternKey.startsWith("/") && [ 'g', 'i', 'm', 'u', 's', 'y' ].some((flag) => foundFlags.includes(flag))
+            : patternKey.startsWith("/") && patternKey.endsWith("/");
+
         if (isRange) {
             const [start, end] = patternKey.split("..=").map(s => isNaN(Number(s)) ? s : Number(s));
 
@@ -55,12 +61,12 @@ export function match<T, U = never>(value: any, patterns: MatchPatterns<T, U>):
             }
         } else if (isOr) {
             const patternValues = patternKey.split("|").map(s => isNaN(Number(s)) ? s : Number(s));
-            
+
             if (patternValues.includes(value)) {
                 return patterns[p]();
             }
         } else if (isRegex) {
-            const regex = new RegExp(patternKey.slice(1, -1));
+            const regex = new RegExp(patternKey.slice(1, lastSlashIndex), foundFlags.join(""));
 
             if (regex.test(value)) {
                 return patterns[p]();

tests/match-pattern.test.ts

@@ -13,6 +13,7 @@ describe('testing match pattern function', () => {
     "1..=13": () => "Between 1 and 13",
     "25 | 50 | 100": () => "A bill",
     "/[a-z]/": () => "A lowercase letter",
+    "/boost/i": () => "case ignored",
     "_": () => "default",
   };
 
@@ -34,6 +35,7 @@ describe('testing match pattern function', () => {
     expect(match(10, matchValidates)).toBe("Between 1 and 13");
     expect(match(25, matchValidates)).toBe("A bill");
     expect(match("z", matchValidates)).toBe("A lowercase letter");
+    expect(match("BOOST", matchValidates)).toBe("case ignored");
     expect(match("1", matchValidates)).toBe("default");
   });
 
@@ -45,4 +47,4 @@ describe('testing match pattern function', () => {
       [Coin.Quarter]: () => 25,
     })).toBe(10);
   });
-});
+});