## How to Match Repeating Characters in Go\'s Regexp Without Backreference?

Matching Repeating Characters in Go's Regexp

In Go's regexp, matching repeating characters can be a challenge since backreference is not supported. This can be frustrating, especially when you need to perform complex pattern matching tasks.

To address this limitation, there are two potential solutions:

1. Use an Alternative Regexp Library:

One option is to use a third-party regexp library that does support backreference. A popular choice is "glenn-brown/golang-pkg-pcre." This library provides a comprehensive set of regular expression features, including backreference.

2. Custom Loop Approach:

If using an external library is not feasible, you can opt for a custom loop approach to perform the analysis without regexp. This involves iterating over the string, checking for consecutive character matches, and building the matches incrementally.

While this approach may be less efficient than using a regexp, it offers greater control and flexibility over the matching process. The following code snippet illustrates how this can be implemented:

<code class="go">package main

import "fmt"

func main() {
    str := "abccdeff"
    matches := []string{}

    for i := 1; i < len(str); i++ {
        if str[i] == str[i-1] {
            matches = append(matches, str[i-1:i+1])
        }
    }

    fmt.Println(matches)
}</code>

Output:

[cc ff]

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