lib/manager/pipenv/update.js
function matchAt(content, index, match) {
  return content.substring(index, index + match.length) === match;
}
function matchAt(content, index, match) {
  return content.substring(index, index + match.length) === match;
}
function matchAt ( content , index , match ) { return content . substring ( index , index + match . length ) === match ; }
Return true if the match string is found at index in content
Return true if the match string is found at index in content