使用jQuery仅以输入形式禁用标签和数字

Question

I have a form and I would like to disable < > # @ and numbers alone ('test 123' should work).

For the first condition I tried

if ( $(this).val().match("^[^>#<@*]+$") ) { // todo }

But it matches everytime..

I have already checked on Stackoverflow, W3Schools etc but I don't know why I cannot apply the regex

Thank you

Answer 1

If I understand correctly, you want to match string with at least one character that is not a digit and without the following characters : <, >, # and @
You can do that with this regex :
(?=.*\\D)[^<>#@]*

Answer 2

Try below: using RegExp object you can test the pattern as shown below

var regEx = new RegExp("[0-9a-zA-Z\\s]+"); 
if ( regEx.test($(this).val()) ) 

Answer 3

You need to add a negative lookbehind to the pattern you used and define the regex like

/^(?!\d+$)[^>#<@*]+$/

See the regex demo (note \\n is added since the demo input string contains line breaks).

Details :

• ^ - start of string
• (?!\\d+$) - the input string cannot consist of only 1+ digits
• [^>#<@*]+ - 1 or more chars other than > , # , < , @ , *
• $ - end of string.

Use it with a RegExp#test to only return true or false (with String#match , there is unnecessary overhead related to returning all the array with values that you do not need here):

if (/^(?!\d+$)[^>#<@*]+$/.test($(this).val())) {....}