Build the -v flag of the Unix grep command. Given a list of lines and a search pattern, return all lines that DO NOT contain pattern as a substring (case-sensitive). Return the remaining lines (the ones that do not contain the pattern), in their original order, joined by newline characters (\n).
Function signature:
func grepInvert(_ lines: [String], _ pattern: String) -> String
Example:
Input: pattern = "err" lines = ["error", "ok", "another error", "fine"] Output: "ok\nfine" When printed: ok fine
If every line contains the pattern, return the empty string "".
Same as
grep v1 but flip the condition: keep the lines where !line.contains(pattern) is true, then return result.joined(separator: "\n").
The full solution:
class Solution {
func grepInvert(_ lines: [String], _ pattern: String) -> String {
var result = [String]()
for line in lines {
if !line.contains(pattern) {
result.append(line)
}
}
return result.joined(separator: "\n")
}
}
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