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Is there a regular expression to detect a valid regular expression?
...on.
True regular languages can not decide arbitrarily deeply nested well-formed parenthesis. If your alphabet contains '(' and ')' the goal is to decide if a string of these has well-formed matching parenthesis. Since this is a necessary requirement for regular expressions the answer is no.
Howev...
Simplest/Cleanest way to implement singleton in JavaScript?
...or many jobs, it's not equivalent to a singleton.
singleton pattern:
short form
var Foo = function () {
"use strict";
if (Foo._instance) {
//this allows the constructor to be called multiple times
//and refer to the same instance. Another option is to
//throw an error...
What's an Aggregate Root?
... if the client code needed the LineItem for some other purpose, would that form a seperate aggregate (assuming there would be other objects involved not related to the Order object)?
– Ahmad
Mar 8 '10 at 19:40
...
List of standard lengths for database fields
...
W3C's recommendation:
If designing a form or database that will accept names from people
with a variety of backgrounds, you should ask yourself whether you
really need to have separate fields for given name and family name.
… Bear in mind that names i...
Simplest SOAP example
... // ...
}
</script>
</head>
<body>
<form name="Demo" action="" method="post">
<div>
<input type="button" value="Soap" onclick="soap();" />
</div>
</form>
</body>
</html> <!-- typo -->
...
What's the best UI for entering date of birth? [closed]
...
For an advanced user text input is the best, if the user knows the date format, it is very fast. For a not so advanced user I suggest using a datepicker. Since usually you also have advanced and non-advanced users I suggest a combination of text input and datepicker.
...
Assembly code vs Machine code vs Object code?
...e instructions, and object files may also contain other data (relocation information, symbol tables, ...)
– Christoph
Jan 21 '09 at 20:25
5
...
What are the use(s) for tags in Go?
...
A tag for a field allows you to attach meta-information to the field which can be acquired using reflection. Usually it is used to provide transformation info on how a struct field is encoded to or decoded from another format (or stored/retrieved from a database), but yo...
HTML Entity Decode [duplicate]
...></script>
JS Fiddle.
A more interactive version:
$('form').submit(function() {
var theString = $('#string').val();
var varTitle = $('<textarea />').html(theString).text();
$('#output').text(varTitle);
return false;
});
<script src="https://ajax.googleapi...
How do I set a JLabel's background color?
... its pixels, allowing the underlying pixels to show through.
For more information, read the Java Tutorial How to Use Labels.
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