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This article is about how to use the regular restrictions input box to enter only numbers / English / Chinese and other restrictions. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Common HTML regular expressions

1. You can only enter numbers and English:

The copy code is as follows:

3. You can only enter full-width:

The copy code is as follows:

5. Email address Verification:

The copy code is as follows:

Var regu =

"^ (([0-9a-zA-Z] +) | ([0-9a-zA-Z] + [_ .0-9a9a-zA-Z ZZ -] * [0-9a-zA-Z] +) @ ([a-zA-Z0-9 -] + [.]) + ([a-zA-Z] {2} | net | NET | COM | gov | GOV | mil | org | ORG | edu | EDU | int | INT) $"

Var re = new RegExp (regu)

If (s.search (re)! =-1) {

Return true

} else {

Window.alert ("Please enter a valid E-mail address!")

Return false

}

6. ID card:

The copy code is as follows:

"^ / d {17} (/ / d | x) $"

7.17 regular expressions

The copy code is as follows:

"^ / / non-negative integer" / / 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

"^ -? / / dumped $" / / 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

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

"^ [A-Za-z] + $" / / A string of 26 letters

"^ [Amurz] + $" / / A string of 26 English letters in uppercase

A string of 26 lowercase letters consisting of "^ [amurz] + $" / /

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

A string of numbers, 26 letters, or underscores

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

"^ [a-zA-z] +: / / (/ / w+ (- / / w+) *) (/ /. (/ / w+ (- / / w+) *)) * (/ /? / / S*)? $" / / url

=

1. Cancel the dotted wireframe when the button is pressed

Add an attribute value of hideFocus or HideFocus=true to input

two。 Read-only text box content

Add attribute value readonly to input

3. Prevent backward emptying of TEXT documents (style content can be used as a class reference)

The 4.ENTER key moves the cursor to the next input box

6. Only for numbers (flashing)

The copy code is as follows:

8. You can only enter English and numbers (flashing)

The copy code is as follows:

10. You can only enter numbers, decimal points, minus (-) characters (no flashing)

The copy code is as follows:

11. You can only enter two decimal places and three decimal places (flashing)

The copy code is as follows:

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