How to Match Repeated Characters in Go Without Backreferences?

How to write regex for repeated characters in Go

In this article, we will explore how to construct a regular expression in Go that matches strings containing three or more repeated characters in a row.

The provided regular expressions correctly detect any sequence of three or more characters, but they fail to ensure consecutive repetition. To achieve this precision, we rely on backreferences in regular expressions.

However, Go's RE2 regular expression engine does not support backreferences to maintain linear time string processing efficiency. Therefore, direct implementation of the desired regex is not feasible with RE2.

To address this limitation, one can explore alternative regular expression libraries that support backreferences, such as PCRE. Ultimately, the preferred solution depends on the specific requirements and availability of suitable regexp libraries.

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