What is the basic syntax of Java regular expressions?

The basic syntax for Java regular expressions is as follows:

1. Regular characters: Regular characters include both uppercase and lowercase letters, numbers, and some special characters, like “abc123”.
2. Metacharacters: Metacharacters are special characters that need to be escaped to represent their original meaning, for example, “\d” represents matching digits.
3. Character class: represented by square brackets [], can match any character within the character class, for example “[abc]” can match the characters “a”, “b”, or “c”.
4. “and” in addition to “{n}” and others, for example “a.”
5. Boundary Matching: It includes “^” for matching the beginning of a string, “$” for matching the end of a string, and “\b” for matching word boundaries.
6. Grouping and capturing: Use parentheses () to represent groups, which can capture or reference matched content.
7. Escape character: Using a backslash \ for escaping, which indicates that the following character has a special meaning, for example, “\d” matches digits.
8. Special characters: Some special characters can also be escaped using a backslash, for example, “.” represents the period character.