The article provides a comprehensive guide on using Regular Expressions (RegEx) to manage log data in Coralogix, a platform for analyzing and visualizing log data. It begins with an introduction to RegEx, explaining its importance in efficiently extracting, replacing, and managing log data. The guide covers various use cases, such as extracting specific data from unstructured logs and converting them into structured JSON fields, replacing or removing sensitive data, and using backreferences for substitutions. It also explains how to use RegEx in search queries to find specific log entries and set up alerts for specific patterns. The guide includes detailed examples and explanations of RegEx syntax, character classes, quantifiers, and modifiers, emphasizing the practical applications of RegEx in enhancing log data management and alerting systems within Coralogix.