How Can I Efficiently Find Overlapping Patterns in Go Strings Without Regular Expressions?

Overcoming Overlapping Patterns in Golang

Despite the limitations of regular expressions in handling overlapping matches, there are alternatives for extracting overlapping patterns in Golang. While complex expressions may be tempting, they often lead to unnecessary complexities and inefficiencies.

One effective approach is to utilize the intuitive nature of strings.Index and a for loop. For instance, to find the indices of the pattern "..#..", you can iterate over the input string using strings.Index and accumulate the indices in a list.

input := "...#...#....#.....#..#..#..#......."
idx := []int{}
j := 0
for {
    i := strings.Index(input[j:], "..#..")
    if i == -1 {
        break
    }
    fmt.Println(j)
    idx = append(idx, j+i)
    j += i+1
}
fmt.Println("Indexes:", idx)

This approach simplifies the matching process, provides better control over the matches, and improves efficiency by avoiding unnecessary regular expression operations. The straightforward nature of the loop makes it easy to handle various patterns and string combinations.

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