user: Write 12 examples of regex strings using proper syntax. Display in table format. In the first column, write the string. In the second column, write what it does. In the third column, write where you would use it, and where it should be included in your file. In the fourth column, break it down and explain each part in detail. 

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assistant: Regex String	Description	Use Case	Explanation
^abc	Matches any string that starts with "abc"	To find lines in a text file that start with "abc"	^ asserts the start of a line, and abc is the literal string
abc$	Matches any string that ends with "abc"	To find lines in a text file that end with "abc"	abc is the literal string, and $ asserts the end of a line
a.b	Matches any string containing "a", any character, and then "b"	To find occurrences of "a" followed by any character and then "b"	a and b are literal characters, and . matches any character except a newline
\d{2,4}	Matches a sequence of 2 to 4 digits	To validate a year input with 2 to 4 digits	\d matches any digit, and {2,4} specifies a range of 2 to 4 occurrences
[A-Za-z]	Matches any single uppercase or lowercase letter	To find single letters in a text file	[A-Za-z] defines a character class containing all uppercase and lowercase letters
[^0-9]	Matches any character that is not a digit	To find non-digit characters in a text file	[^0-9] defines a character class with a negation (^) and a range for digits (0-9)
`(abc|def)`	Matches either "abc" or "def"	To find occurrences of either "abc" or "def" in a text file
a{3}	Matches exactly three consecutive "a" characters	To find occurrences of "aaa" in a text file	a is the literal character, and {3} specifies exactly 3 occurrences
\bword\b	Matches the word "word" as a whole word	To search for the whole word "word" in a text file	\b asserts a word boundary, and word is the literal string
(?i)abc	Matches "abc" case-insensitively	To find occurrences of "abc" regardless of case	(?i) sets the case-insensitive flag, and abc is the literal string
(\d+)\s+	Matches one or more digits followed by one or more whitespace characters	To find and separate numbers followed by spaces in a text file	(\d+) captures one or more digits, and \s+ matches one or more whitespace characters
(?<=@)\w+	Matches a word that follows the "@" symbol	To extract usernames from email addresses	(?<=@) is a positive lookbehind for the "@" symbol, and \w+ matches one or more word characters

user: Reformat your answer, it looks very bad

assistant: | Regex String | Description                                          | Use Case                                               | Explanation                                                                 |
|--------------|------------------------------------------------------|--------------------------------------------------------|-----------------------------------------------------------------------------|
| ^abc         | Matches any string that starts with "abc"            | To find lines in a text file that start with "abc"     | ^ asserts the start of a line, and abc is the literal string                |
| abc$         | Matches any string that ends with "abc"              | To find lines in a text file that end with "abc"       | abc is the literal string, and $ asserts the end of a line                  |
| a.b          | Matches any string containing "a", any character, and then "b" | To find occurrences of "a" followed by any character and then "b" | a and b are literal characters, and . matches any character except a newline |
| \d{2,4}      | Matches a sequence of 2 to 4 digits                  | To validate ayear input with 2 to 4 digits                        | \d matches any digit, and {2,4} specifies a range of 2 to 4 occurrences        |
| [A-Za-z]      | Matches any single uppercase or lowercase letter | To find single letters in a text file | [A-Za-z] defines a character class containing all uppercase and lowercase letters |
| [^0-9]       | Matches any character that is not a digit          | To find non-digit characters in a text file | [^0-9] defines a character class with a negation (^) and a range for digits (0-9) |
| (abc\|def)   | Matches either "abc" or "def"                      | To find occurrences of either "abc" or "def" in a text file | (abc\|def) uses the \| symbol to indicate either "abc" or "def"                |
| a{3}         | Matches exactly three consecutive "a" characters   | To find occurrences of "aaa" in a text file | a is the literal character, and {3} specifies exactly 3 occurrences            |
| \bword\b | Matches the word "word" as a whole word | To search for the whole word "word" in a text file | \b asserts a word boundary, and word is the literal string |
| (?i)abc      | Matches "abc" case-insensitively                   | To find occurrences of "abc" regardless of case | (?i) sets the case-insensitive flag, and abc is the literal string |
| (\d+)\s+     | Matches one or more digits followed by one or more whitespace characters | To find and separate numbers followed by spaces in a text file | (\d+) captures one or more digits, and \s+ matches one or more whitespace characters |
| (?<=@)\w+    | Matches a word that follows the "@" symbol         | To extract usernames from email addresses | (?<=@) is a positive lookbehind for the "@" symbol, and \w+ matches one or more word characters |