A regular expression is a special text consisting of letters and symbols that can be used to find sentences in a text that meet the format you want.
A regular expression is a pattern that matches the main string from left to right. The term "Regular expression" is a bit cumbersome, and we often use the abbreviated terms "regex" or "regexp". Regular expressions can be used to replace strings in a base string based on a certain matching pattern, validate forms, extract strings, and so on.
Learn Regular Expressions (learn-regex)
Regular Expression Front-end Usage Manual
any86/any-rule: 🦕 Comprehensive Regular Expression Collection, supporting web / vscode / idea / Alfred Workflow multi-platform (github.com)