Javascript controls the input to only allow various specified content _ javascript skills

This article mainly introduces various types of specified content that only allow input through javascript control. For more information, see 1. Only allow input numbers.

2. Only English letters, numbers, and underscores (_) are allowed)

3. Only English letters, numbers, and = @ # are allowed @#

4. Only Chinese characters are allowed

1. Only numbers are allowed.

2. Only English letters, numbers, and underscores (_) are allowed)

3. Only English letters, numbers, and = @ # are allowed @#

4. Only Chinese characters are allowed

Only numbers are allowed: "^ [0-9] * $ ".
Only n digits can be entered: "^ \ d {n} $ ".
You can only enter at least n digits: "^ \ d {n,} $ ".

Only m ~ can be input ~ N-digit :. "^ \ 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 })? $ ".

Only 1 ~ Positive number of three 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] + $ ".
You can only enter a string consisting of 26 uppercase letters: "^ [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] + $ ".

You can only enter a string consisting of digits, 26 English letters, or underscores (_): "^ \ w + $ ".

Verify the User Password: "^ [a-zA-Z] \ w {5, 17} $". The correct format is: start with a letter, with a length of 6 ~ It can only contain characters, numbers, and underscores.

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

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

Only numbers and decimal points can be entered. paste-resistant: