Create: 10-Regular-Expression-Matching.ts

Author: Ykhan799

typescript/10-Regular-Expression-Matching.ts

@@ -0,0 +1,31 @@
+function isMatch(s: string, p: string): boolean {
+    let lenS = s.length;
+    let lenP = p.length;
+    let map = {};
+    
+    return check(0, 0);
+    
+    function check(idxS: number, idxP: number): boolean {
+        if (map[idxS + ':' + idxP] !== undefined) {
+            return map[idxS + ':' + idxP];
+        }
+        
+        if (idxS > lenS) {
+            return false;
+        }
+        
+        if (idxS === lenS && idxP === lenP) {
+            return true;
+        }
+        
+        if (p[idxP] === '.' || p[idxP] === s[idxS]) {
+            map[idxS + ':' + idxP] = p[idxP + 1] === '*' ? check(idxS + 1, idxP) || check(idxS, idxP + 2) : check(idxS + 1, idxP + 1);
+        }
+        
+        else {
+            map[idxS + ':' + idxP] = p[idxP + 1] === '*' ? check(idxS, idxP + 2) : false;
+        }
+        
+        return map[idxS + ':' + idxP];
+    }
+};