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Regex to match a digit two or four times
...t;-- alternation: four digits or two
\d{2}(?:\d{2})? <-- two digits, and optionally two more
(?:\d{2}){1,2} <-- two digits, times one or two
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List files in local git repo?
I'm using Sparkleshare, which uses Git to sync files between my laptop and my backup server.
3 Answers
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Why are C character literals ints instead of chars?
...ar) == 1 . This makes intuitive sense, since 'a' is a character literal, and sizeof(char) == 1 as defined by the standard.
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What is the theoretical maximum number of open TCP connections that a modern Linux box can have
...a '64K' limit that is often cited, but that is per client per server port, and needs clarifying.
Each TCP/IP packet has basically four fields for addressing. These are:
source_ip source_port destination_ip destination_port
< client > < server >
Inside the...
How to use Git Revert
...tion(+), 1 deletion(-)
In this example the commit history has two commits and the last one is a mistake. Using git revert:
$ git revert HEAD
[master 1db4eeb] Revert "bad update"
1 file changed, 1 insertion(+), 1 deletion(-)
There will be 3 commits in the log:
$ git log --oneline
1db4eeb Revert "b...
Including jars in classpath on commandline (javac or apt)
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Note for Windows users, the jars should be separated by ; and not :.
for example:
javac -cp external_libs\lib1.jar;other\lib2.jar;
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What's the difference between and
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<?> and <? extends Object> are synonymous, as you'd expect.
There are a few cases with generics where extends Object is not actually redundant. For example, <T extends Object & Foo> will cause T to become Object ...
jQuery find parent form
...l inputs, this is much faster than .closest() (5-10 times faster in Chrome and IE8). Works on IE6 & 7 too.
var input = $('input[type=submit]');
var form = input.length > 0 ? $(input[0].form) : $();
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.prop('checked',false) or .removeAttr('checked')?
...ect for modern browsers because the attribute represents the initial value and the property represents the current (dynamic) value.
It is almost always a mistake to use .removeAttr( "checked" ) on a DOM element. The only time it might be useful is if the DOM is later going to be serialized back to a...
Inserting string at position x of another string
I have two variables and need to insert string b into string a at the point represented by position . The result I'm looking for is "I want an apple". How can I do this with JavaScript?
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