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‎docs/examples.md‎

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# rexplain Examples
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This page demonstrates how rexplain explains, tests, and generates examples for real-world regex patterns.
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---
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## Email Address
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**Pattern:**
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```
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^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$
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```
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**Explanation:**
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```
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^ - asserts position at the start of a line
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[a-zA-Z0-9._%+-]+ - matches any character in the set [a-zA-Z0-9._%+-] one or more times (greedy)
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@ - matches the character '@' (ASCII 64) literally (case sensitive)
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[a-zA-Z0-9.-]+ - matches any character in the set [a-zA-Z0-9.-] one or more times (greedy)
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\. - matches the character '.' (ASCII 46) literally (case sensitive)
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[a-zA-Z]{2,} - matches any character in the set [a-zA-Z] 2 to unlimited times
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$ - asserts position at the end of a line
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```
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**Example Matches:**
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- user@example.com
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- hello.world+test@sub.domain.co
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---
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## US Phone Number
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**Pattern:**
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```
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^\(\d{3}\) \d{3}-\d{4}$
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```
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**Explanation:**
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```
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^ - asserts position at the start of a line
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\( - matches the character '(' (ASCII 40) literally (case sensitive)
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\d{3} - matches a digit character exactly 3 times
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\) - matches the character ')' (ASCII 41) literally (case sensitive)
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- matches the character ' ' (ASCII 32) literally (case sensitive)
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\d{3} - matches a digit character exactly 3 times
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- - matches the character '-' (ASCII 45) literally (case sensitive)
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\d{4} - matches a digit character exactly 4 times
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$ - asserts position at the end of a line
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```
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**Example Matches:**
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- (123) 456-7890
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- (555) 867-5309
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---
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## URL (Simple)
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**Pattern:**
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```
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https?://[\w.-]+(?:\.[\w\.-]+)+[/\w\.-]*
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```
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**Explanation:**
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```
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h - matches the character 'h' (ASCII 104) literally (case sensitive)
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t - matches the character 't' (ASCII 116) literally (case sensitive)
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t - matches the character 't' (ASCII 116) literally (case sensitive)
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p - matches the character 'p' (ASCII 112) literally (case sensitive)
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s? - matches the character 's' (ASCII 115) zero or one time (greedy)
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: - matches the character ':' (ASCII 58) literally (case sensitive)
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/ - matches the character '/' (ASCII 47) literally (case sensitive)
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/ - matches the character '/' (ASCII 47) literally (case sensitive)
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[\w.-]+ - matches any character in the set [\w.-] one or more times (greedy)
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(?:\.[\w\.-]+)+ - a non-capturing group containing:
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\. - matches the character '.' (ASCII 46) literally (case sensitive)
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[\w\.-]+ - matches any character in the set [\w\.-] one or more times (greedy)
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repeated one or more times (greedy)
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[/\w\.-]* - matches any character in the set [/\w\.-] zero or more times (greedy)
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```
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**Example Matches:**
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- http://example.com
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- https://sub.domain.co.uk/path/to/page
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---
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## Password (At least 8 chars, 1 digit, 1 uppercase, 1 lowercase)
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**Pattern:**
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```
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^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[A-Za-z\d]{8,}$
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```
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**Explanation:**
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```
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^ - asserts position at the start of a line
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(?=.*[a-z]) - a lookahead group (must be followed by) containing:
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.* - matches any character zero or more times (greedy)
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[a-z] - matches any character in the set [a-z]
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(?=.*[A-Z]) - a lookahead group (must be followed by) containing:
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.* - matches any character zero or more times (greedy)
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[A-Z] - matches any character in the set [A-Z]
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(?=.*\d) - a lookahead group (must be followed by) containing:
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.* - matches any character zero or more times (greedy)
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\d - matches a digit character
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[A-Za-z\d]{8,} - matches any character in the set [A-Za-z\d] 8 to unlimited times
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$ - asserts position at the end of a line
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```
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**Example Matches:**
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- Password1
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- Abcdefg8
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- XyZ12345
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---
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## Date (YYYY-MM-DD)
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**Pattern:**
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```
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^\d{4}-\d{2}-\d{2}$
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```
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**Explanation:**
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```
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^ - asserts position at the start of a line
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\d{4} - matches a digit character exactly 4 times
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- - matches the character '-' (ASCII 45) literally (case sensitive)
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\d{2} - matches a digit character exactly 2 times
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- - matches the character '-' (ASCII 45) literally (case sensitive)
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\d{2} - matches a digit character exactly 2 times
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$ - asserts position at the end of a line
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```
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**Example Matches:**
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- 2023-01-01
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- 1999-12-31

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