How Can I Identify Strings with Three Consecutive Identical Characters Using Go\'s RE2 Regex?

Finding Repeated Characters with Regular Expressions

Problem:

You are attempting to develop a regular expression that identifies strings containing at least three consecutive identical characters.

Attempted Solutions:

You have experimented with the following regex patterns:

• [A-Za-z0-9]{3,}
• (.){3,}
• (.)\1{3,}

However, these expressions match any three characters in sequence, not specifically consecutive occurrences.

The Crux:

The issue lies in the fact that traditional regular expressions lack the ability to implement backreferences, which are irregular expressions that allow you to refer to previously matched substrings. Backreferences are essential for capturing consecutive character sequences.

Solution:

Regrettably, Go's RE2 regexp engine does not support backreferences. Therefore, you cannot fulfill your requirement using standard regular expressions in Go.

Alternative Approaches:

• Explore alternative regexp libraries that support backreferences, such as PCRE.
• Implement string parsing manually without relying on backreferences.

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