Merge branch 'master' into tokenRegistry

# Conflicts:
#	src/0x.js.ts

2 files changed, 4 insertions, 5 deletions

diff --git a/src/0x.js.ts b/src/0x.js.ts
index 7e48bc0a5..f3da005f8 100644
--- a/src/0x.js.ts
+++ b/src/0x.js.ts
@@ -18,9 +18,9 @@ import {SolidityTypes, ECSignature, ZeroExError} from './types';
 const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
 
 export class ZeroEx {
-    public web3Wrapper: Web3Wrapper;
     public exchange: ExchangeWrapper;
     public tokenRegistry: TokenRegistryWrapper;
+    private web3Wrapper: Web3Wrapper;
     /**
      * Computes the orderHash given the order parameters and returns it as a hex encoded string.
      */
diff --git a/src/web3_wrapper.ts b/src/web3_wrapper.ts
index 97d04db8c..a915a89e8 100644
--- a/src/web3_wrapper.ts
+++ b/src/web3_wrapper.ts
@@ -49,10 +49,9 @@ export class Web3Wrapper {
     }
     public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
         const code = await promisify(this.web3.eth.getCode)(address);
-        // Regex matches 0x0, 0x00, 0x in order to accomodate poorly implemented clients
-        const zeroHexAddressRegex = /^0x0*$/i;
-        const didFindCode = _.isNull(code.match(zeroHexAddressRegex));
-        return didFindCode;
+        // Regex matches 0x0, 0x00, 0x in order to accommodate poorly implemented clients
+        const codeIsEmpty = /^0x0{0,40}$/i.test(code);
+        return !codeIsEmpty;
     }
     public async signTransactionAsync(address: string, message: string): Promise<string> {
         const signData = await promisify(this.web3.eth.sign)(address, message);