Problem with searching a string containing brackets

Hi,
I am using a string containing brackets as an argument to search. I am getting following error:
Using network 'development'.

SyntaxError: Invalid regular expression: /send(/: Unterminated group
at String.search (<anonymous>)
at module.exports (/home/zulfi/Truffle_programs/js_search_opcode_js/search_sendb.js:15:22)
at Object.exec (/home/zulfi/.nvm/versions/node/v10.23.3/lib/node_modules/truffle/build/webpack:/packages/require/require.js:127:1)
at Promise (internal/util.js:274:30)
at new Promise (<anonymous>)
at bound exec (internal/util.js:273:12)
at Object.run (/home/zulfi/.nvm/versions/node/v10.23.3/lib/node_modules/truffle/build/webpack:/packages/core/lib/commands/exec.js:80:1)
at process._tickCallback (internal/process/next_tick.js:68:7)


My code is:

var assert = require('assert');
const path = require("path");
const fs = require("fs");

module.exports = async function(callback)
{
  try{
  let keyWordStr1 = "address1.send(400)"
  let keyWordStr2 = "address2.transfer(500)"
  let commandS="send("
  let commandT="transfer("
  let sendStr = ""
  let transferStr = ""

  if(keyWordStr1.search(commandS) >= 0){
  sendStr = keyWordStr1
  console.log(sendStr)
  }
  if(keyWordStr2.search(commandT) >= 0){
  transferStr = keyWordStr[k]
  console.log(transferStr)
  }
  }//try
  catch (error) {
  console.log(error)
  }
  callback();


}

Code (markup):

Somebody please guide me.

Zulfi.

 

Already tried to replace 'search' with 'indexOf'?
eg:
if(keyWordStr1.indexOf(commandS) > -1){