C # favorite Regular Expressions

"^/D + $" // non-negative integer (positive integer + 0)

"^ [0-9] * [1-9] [0-9] * $" // positive integer

"^ (-/D +) | (0 +) $" // non-positive integer (negative integer + 0)

"^-[0-9] * [1-9] [0-9] * $" // negative integer

"^ -? /D + $ "// integer

"^/D + (/./d + )? $ "// Non-negative floating point number (Positive floating point number + 0)

"^ ([0-9] + /. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] */. [0-9] +) | ([0-9] * [1-9] [0-9] *) $ "// Positive floating point number

"^ (-/D + (/./d + )?) | (0 + (/. 0 + )?)) $ "// Non-Positive floating point number (negative floating point number + 0)

"^ (-([0-9] + /. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] */. [0-9] +) | ([0-9] * [1-9] [0-9] *) $ "// negative floating point number

"^ (-? /D +) (/./d + )? $ "// Floating point number

"^ [A-Za-Z] + $" // a string consisting of 26 English letters

"^ [A-Z] + $" // a string consisting of 26 uppercase letters

"^ [A-Z] + $" // a string consisting of 26 lowercase letters

"^ [A-Za-z0-9] + $" // string consisting of digits and 26 letters

"^/W + $" // a string consisting of digits, 26 letters, or underscores

"^ [/W-] + (/. [/W-] +) * @ [/W-] + (/. [/W-] +) + $ "// email address

"^ [A-Za-Z] +: // (/W + (-/W + )*)(/. (/W + (-/W + )*))*(/? /S *)? $ "// URL

Only numbers can be entered: "^ [0-9] * $"

Only n digits can be entered: "^/d {n} $"

You can only enter at least N digits: "^/d {n,} $"

Only M-N digits can be entered: "^/d {m, n} $"

Only numbers starting with zero and non-zero can be entered: "^ (0 | [1-9] [0-9] *) $"

Only positive numbers with two decimal places can be entered: "^ [0-9] + (. [0-9] {2 })? $"

You can only enter a positive number with 1-3 decimal places: "^ [0-9] + (. [0-9] {1, 3 })? $"

Only a non-zero positive integer can be entered: "^/+? [1-9] [0-9] * $"

Only a non-zero negative integer can be entered: "^/-[1-9] [0-9] * $"

Only 3 characters can be entered: "^. {3} $"

You can only enter a string consisting of 26 English letters: "^ [A-Za-Z] + $"

Only a string consisting of 26 uppercase letters can be entered: '^ [A-Z] + $"

You can only enter a string consisting of 26 lower-case English letters: "^ [A-Z] + $"

You can only enter a string consisting of a number and 26 English letters: '^ [A-Za-z0-9] + $"

Only a string consisting of digits, 26 English letters, or underscores can be entered: "^/W + $"

Verify the User Password: "^ [A-Za-Z]/W {5, 17} $". The correct format is: starts with a letter and ranges from 6 to 18,

It can only contain characters, numbers, and underscores.

Check whether ^ % & ',; =? $/"And other characters:" [^ % & ',; =? $/X22] +"

Only Chinese characters can be entered: "^ [/u4e00-/u9fa5], {0,} $"

Verify email address: "^/W + ([-+.] /W +) * @/W + ([-.] /W + )*/. /W + ([-.] /W +) * $"

Verify interneturl: "^ http: // ([/W-] +/.) + [/W-] + (/[/W -./? % & =] *)? $"

Verification phone number: "^ (/d {3, 4}/) |/d {3, 4 }-)? /D {7, 8} $"

Correct format: XXXX-XXXXXXX, XXXX-XXXXXXXX, XXX-XXXXXXX ",

XXX-XXXXXXXX, xxxxxxx, XXXXXXXX ".

Verify the ID card number (15 or 18 digits): "^/d {15} |/d {} 18 $"

12 months of verification: "^ (0? [1-9] | 1 [0-2]) $ "the correct format is:" 01 "-" 09 "and" 1 "" 12"

31 days of verification for a month: "^ (0? [1-9]) | (1 | 2) [0-9]) | 30 | 31) $"

The correct format is "01", "09", and "1", "31 ".