Replace regex with index and substring

In case name of the file doesn't match the actual contract name,
the regex would not be valid.

Instead, we just pick the contract name following colon.

Author: 0237h

packages/cli/src/command-helpers/abi.ts

@@ -151,11 +151,12 @@ export const getContractNameForAddress = async (
 ): Promise<string> => {
   try {
     const contractSourceCode = await fetchSourceCodeFromEtherscan(network, address);
-    let contractName = contractSourceCode.result[0].ContractName;
-    // Some explorers will return the full path of the contract instead of just the name
-    const regex = /(?<contract>.+)\.sol:\1$/;
+    let contractName: string = contractSourceCode.result[0].ContractName;
 
-    if (regex.test(contractName)) contractName = regex.exec(contractName)?.groups?.contract;
+    // Some explorers will return the full path of the contract instead of just the name
+    // Example: contracts/SyncSwapRouter.sol:SyncSwapRouter
+    if (contractName.includes(':'))
+      contractName = contractName.substring(contractName.lastIndexOf(':') + 1);
 
     logger('Successfully getContractNameForAddress. contractName: %s', contractName);
     return contractName;