Google search from entry to proficient v4.0 (2)

■ 7. Miscellaneous syntax
7.1 Wildcard
Many search engines support wildcard numbers. For example, "*" represents a series of characters, "?" Represents a single character. Google has limited support for wildcard characters. At present, it can only use "*" to replace a single character, and contain "*" must be caused. For example, "" governing the country "means to search for the first four-character phrase" take "and the last two words" govern the country ". The" * "in the middle can be any character.
7.2. Uppercase/lowercase keywords
Google is not case sensitive to English characters. The search results for "GOD" and "god" are the same.
7.3 search for the entire phrase or sentence
Google keywords can be words (with no spaces in the middle) or phrases (with spaces in the middle ). However, if you use a phrase as a keyword, you must enclose it in quotation marks. Otherwise, spaces are treated as "and" operators.
Example: search for the English information about the First World War.
Search: "world war I ""
Result: a total of 937,000 query results have been searched for "world war I" on the internet. This is item 1-10.
The search time is 0.06 seconds.
7.4. Characters ignored by search engines and mandatory search
Google frequently-used English words, such as "I", "com", and "www", and some symbols such as "*" and "..
Example: search for some historical information about the origin of www.
Search: "Historical internet of www"
Result: the following words are not included in the search range because they are used too frequently: The Chinese (simplified) web pages related to the historical internet of www have been searched.
There are about 75,100 query results, which are 1-10.
The search time is 0.22 seconds.

We can see that the search for "www historical internet" is omitted by the search engine. Therefore, the above search only searches for "history" and "internet ". This obviously does not meet the requirements. Here, by the way, I have some knowledge about word segmentation in search engines. When we search for "www history", the search engine actually divides this phrase into three parts: "www", "of", and "history, this is the word segmentation of the search engine. Therefore, even if you enter a continuous "www history", the search engine uses this phrase as a separate search for three keywords.
If you want to forcibly search for ignored keywords, you need to add the plaintext "+" before the keyword.
Search: "+ www + Historical internet"
Result: a Chinese (simplified) webpage with a historical internet connection with + www + has been searched.
There are about 25,000 query results, which are 1-10.
The search time is 0.05 seconds.

Another way to force the search is to use double quotation marks. In the above example, "world war I", "I" is actually a Ignore word, but because it is caused by double quotation marks, the search engine forces the search for this specific phrase.