MongoDB (14 regular operations)

3.2.4.9 Regular operations

If you want to implement a fuzzy query, you must use a regular expression, and the language used by the regular expression is the form of a Perl-compatible regular expression.

If you want to implement regular use, define the format as follows:

• Base syntax: {key: Regular tag}
• Full syntax: {key: {"$regex": Regular tag, "$options": Option}}

The key to the options is to set the regular information query tag:

• "I": ignoring the case of letters;
• "M": Multi-line lookup;
• "X": The blank string is escaped except;
• "S": matches all characters (regular dots indicate matches of any character, i.e. ".") ), including line-wrapping content.

MongoDB (14 regular operations)