javascript - Checking input values for special symbols - Stack Overflow

admin管理员组

文章数量:1405900

I am having two text fields in my form. The data to be entered in the field are Name and City respectively. I want to check that the user has not entered any special symbols like !,@,#........ i.e, the only thing user should enter must be belonging to a-z,A-Z, though the user can enter Underscore(_), but no numbers, no special symbols.

I want to check this using JavaScript, how can this be achieved.

Thanks in advance.

I am having two text fields in my form. The data to be entered in the field are Name and City respectively. I want to check that the user has not entered any special symbols like !,@,#........ i.e, the only thing user should enter must be belonging to a-z,A-Z, though the user can enter Underscore(_), but no numbers, no special symbols.

I want to check this using JavaScript, how can this be achieved.

Thanks in advance.

• javascript
• validation

Share Improve this question Follow asked Oct 4, 2010 at 8:06 LoganLogan 2,51555 gold badges3838 silver badges5959 bronze badges

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 5

A classic problem that's usually solved with the help of regular expressions.

var myString = "London";
if (myString.match(/^[a-zA-Z_]+$/)) {
    // Success
}

If you want to allow spaces, like for New York, change the pattern to /^[a-zA-Z_\s]+$/.

本文标签： javascriptChecking input values for special symbolsStack Overflow