什么 JavaScript RegEx 允许除某些特殊字符之外的字母数字字符？

Question

I need a JavaScript regular expression that allows all alphanumeric characters and rejects "&" (ampersand), ";" (semicolon), and " ' " (apostrophe) .

I know how to allow only certain characters, such as ^[a-zA-Z0-9 @$]*$ —this allows all alphanumeric characters, spaces, "@" (at-sign), and "$" (dollar-sign).

How could I tell it to allow all special characters except "&", ";"and " ' " , while allowing all alphanumeric ones?

Answer 1

If the whole purpose is to allow everything except for the & , ; , and ' symbols, you could just ignore those:

[^&;']*

This should allow all alpha-numeric symbols and every other special character.

If your list of acceptable/rejected characters is more complicated, it may be easier to write a regex specifying what's allowed , like your original sample of ^[a-zA-Z0-9 @$]*$ . It all depends on what your needs are and/or if they'll change (I, personally, would prefer your original regex if it's not going to change much).

Answer 2

The format [^ ] is the opposite of [ ] . So to do what you want, try this:

^[a-zA-Z0-9 @$]*|[^&;\`]*

Answer 3

/^[a-zA-Z0-9 @$] |[^&;`,"'%!.()] $/