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 (inteal/util.js:274:30)...

Problem with searching a string containing brackets WordPress ...