大约有 23,000 项符合查询结果（耗时：0.0359秒） [XML]
How to search for occurrences of more than one space between words in a line
... \w[ ]{2,}\w will fail to match word.<2 spaces>more words or a string that consists entirely of spaces. [^\s]([ ]{2,})[^\s]\w will fail on lines that start with spaces or strings like bla<2 spaces>....
– Tim Pietzcker
Sep 21 '10 at 9:48
...
Run a single migration file
...iveRecord::Migration
def change
add_column :products, :part_number, :string
end
end
You can create an instance of the migration and run migrate(:up) or migrate(:down) on an instance, like this:
$ rails console
>> require "db/migrate/20090408054532_add_part_number_to_products.rb"
>...
How do I properly escape quotes inside HTML attributes?
I have a drop down on a web page which is breaking when the value string contains a quote.
7 Answers
...
How do you search for files containing DOS line endings (CRLF) with grep on Linux?
...Ctrl+V, Ctrl+M to enter a literal Carriage Return character into your grep string. So:
grep -IUr --color "^M"
will work - if the ^M there is a literal CR that you input as I suggested.
If you want the list of files, you want to add the -l option as well.
Explanation
-I ignore binary files
-U preve...
How does Google Instant work?
... and obviously related to this question. You can read how they tackled the extra load (5-7X according to the article) on the server-side, for example. The answer below examines what happens on the client-side:
Examining with Firebug, Google is doing an Ajax GET request on every keypress:
I gue...
What's a correct and good way to implement __hash__()?
... studied a wide variety of hash functions. He told me that
for c in some_string:
hash = 101 * hash + ord(c)
worked surprisingly well for a wide variety of strings. I've found that similar polynomial techniques work well for computing a hash of disparate subfields.
...
Check that an email address is valid on iOS [duplicate]
...
Good cocoa function:
-(BOOL) NSStringIsValidEmail:(NSString *)checkString
{
BOOL stricterFilter = NO; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
NSString *stricterFilterString = @"^[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9...
Setting the default value of a DateTime Property to DateTime.Now inside the System.ComponentModel De
...)]
for any other value as last argument of DefaultValueAttribute specify string that represent desired DateTime value.
This value must be constant expression and is required to create object (DateTime) using TypeConverter.
...
Another Repeated column in mapping for entity error
...
Explaining with an example...
@Column(name = "column1")
private String object1;
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "column1", referencedColumnName = "column1")
private TableClass object2;
The problem in the above code snippet is we are repeating mappi...
Convert Linq Query Result to Dictionary
...n keyCollections = dict.Keys;
ICOllection valueCollections = dict.Values;
String[] myKeys = new String[dict.Count];
String[] myValues = new String[dict.Count];
keyCollections.CopyTo(myKeys,0);
valueCollections.CopyTo(myValues,0);
for(int i=0; i<dict.Count; i++)
{
Console.WriteLine("Key: " + my...