[英]JQuery - remove the chars not matching regEx
I am trying to use jquery for validating forms. 我正在尝试使用jquery来验证表单。
This is the pattern that is allowed in a text box for a user. 这是用户的文本框中允许的模式。
var pattern = /^[a-zA-Z0-9!#$&%*+,-./: ;=?@_]/g;
If the user types anything else other than this then that has to be replaced with a "". 如果用户键入除此之外的任何其他内容,则必须用“”替换。
$(document).ready(function() {
$('#iBox').blur(function() {
var jVal = $('#iBox').val();
if(jVal.match(pattern)) {
alert("Valid");
} else {
alert("New "+jVal.replace(!(pattern),""));
}
});
});
});
But the replace function does not work this way. 但是替换功能不能以这种方式工作。
Use a negated character class by writing a ^
immediately after the opening square bracket: 通过在开始方括号后面立即写
^
使用否定字符类 :
/[^a-zA-Z0-9!#$&%*+,-./: ;=?@_]/g
Here the ^
has a special meaning that is different from the normal meaning it has in regular expressions (normally it matches the start of the line). 这里
^
具有特殊含义,与正则表达式中的正常含义不同(通常它与行的开头匹配)。
So your corrected code would look like this: 所以你纠正的代码看起来像这样:
var pattern = /[^a-zA-Z0-9!#$&%*+,-./: ;=?@_]/g;
// ...
alert("New " + jVal.replace(pattern, ""));
Also note that calling replace
doesn't actually change the original string - it returns a modified copy of the string. 另请注意,调用
replace
实际上并不会更改原始字符串 - 它会返回字符串的修改后的副本。 If you want to modify the value of jVal you will need to reassign to it: 如果要修改jVal的值,则需要重新分配给它:
jVal = jVal.replace(pattern, "");
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