Common Regular Expression 1

Example 1: Chinese phone number
(/D {3, 4}/) | (/d {3, 4}-) | (/d {3, 4 }))? /D {7, 8}
1)/d {3, 4}
3 to 4 decimal digits
2) |
Or
3 )?
Match the previous project 0 times or 1 time
Example 2: email address
/W + ([-+.] /W +) * @/W + ([-.] /W + )*/. /W + ([-.] /W + )*
1)/W
Any single character, like a [a-zA-Z0-9 _]
2) +
Match the previous project once or more times
3 )*
Matches the previous project 0 times or more times
4 ).
Match any character except/n
Example 3: mobile phone number
(/D {11}) | (// +/d {13 })
Example 4: Zip code
/D {6}
Example 5: ID card number
/D {18} |/d {15}
Example 6: IP Address
^ (25 [0-5] | 2 [0-4] [0-9] | 1 [0-9] [0-9] | [1-9] [0-9] | [0-9]) /.) {3} (25 [0-5] | 2 [0-4] [0-9] | 1 [0-9] [0-9] | [1-9] [0-9] | [0-9]) $