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 !strings.Contains(line, pattern) is true, then return strings.Join(result, "\n").
The full solution:
func grepInvert(lines []string, pattern string) string {
result := []string{}
for _, line := range lines {
if !strings.Contains(line, pattern) {
result = append(result, line)
}
}
return strings.Join(result, "\n")
}
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