const regex = /(/foo/[sS]*/companies/[sS]*)w+/gm;
const str = `export const companyEndpoint = '/companies'

export const blah = '/companies'
const test = 'test'
export const path = `/foo/${blah}/companies/${test}`
`;
regex.exec(str);

grep '/(/foo/[sS]*/companies/[sS]*)w+/gm' my-file.js
grep -E '/(/foo/[sS]*/companies/[sS]*)w+/gm' my-file.js