Update extracting swarm hash

see https://solidity.readthedocs.io/en/v0.5.11/metadata.html?highlight=cbor#encoding-of-the-metadata-hash-in-the-bytecode

remix-lib/src/util.js

@@ -175,6 +175,20 @@ module.exports = {
     return /a165627a7a72305820([0-9a-f]{64})0029$/
   },
 
+  /**
+    * return a regex which extract the swarmhash from the bytecode, from POC 0.3
+    *
+    * @return {RegEx}
+    */
+  swarmHashExtractionPOC3: function () {
+    return /a265627a7a72315820([0-9a-f]{64})64736f6c6343([0-9a-f]{6})0032$/
+  },
+
+  extractSwarmHash: function (value) {
+    value = value.replace(this.swarmHashExtraction(), '')
+    value = value.replace(this.swarmHashExtractionPOC3(), '')
+  },
+
   /**
     * Compare bytecode. return true if the code is equal (handle swarm hash and library references)
     * @param {String} code1 - the bytecode that is actually deployed (contains resolved library reference and a potentially different swarmhash)
@@ -198,8 +212,8 @@ module.exports = {
       code2 = replaceLibReference(code2, pos)
       code1 = replaceLibReference(code1, pos)
     }
-    code1 = code1.replace(this.swarmHashExtraction(), '')
-    code2 = code2.replace(this.swarmHashExtraction(), '')
+    code1 = this.extractSwarmHash(code1)
+    code2 = this.extractSwarmHash(code2)
     if (code1 && code2 && code1.indexOf(code2) === 0) {
       return true
     }