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Why it's not possible to use regex to parse HTML/XML: a formal explanation in layman's terms
... or bonbon. Matching of recursive/balanced structures make these even more fun.
Wikipedia puts this nicely, in a quote by Larry Wall:
'Regular expressions' [...] are only marginally related to real regular expressions. Nevertheless, the term has grown with the capabilities of our pattern matchi...
How to sort in-place using the merge sort algorithm?
...he rest as working area for merging.
For example like the following merge function.
void wmerge(Key* xs, int i, int m, int j, int n, int w) {
while (i < m && j < n)
swap(xs, w++, xs[i] < xs[j] ? i++ : j++);
while (i < m)
swap(xs, w++, i++);
while (...
Adding new column to existing DataFrame in Python pandas
...)
As per this example (which also includes the source code of the assign function), you can also include more than one column:
df = pd.DataFrame({'a': [1, 2], 'b': [3, 4]})
>>> df.assign(mean_a=df.a.mean(), mean_b=df.b.mean())
a b mean_a mean_b
0 1 3 1.5 3.5
1 2 4 1...
Null vs. False vs. 0 in PHP
...ill get inequality.
So why are they useful ?
Well, look at the strrpos() function. It returns False if it did not found anything, but 0 if it has found something at the beginning of the string !
<?php
// pitfall :
if (strrpos("Hello World", "Hello")) {
// never exectuted
}
// smart move ...
Check if a string is html or not
... purposes your app may want to detect these too.
– TK123
Sep 21 '16 at 19:39
HTML is designed with the forgiveness of ...
Insert, on duplicate update in PostgreSQL?
...RT, as appropriate:
CREATE TABLE db (a INT PRIMARY KEY, b TEXT);
CREATE FUNCTION merge_db(key INT, data TEXT) RETURNS VOID AS
$$
BEGIN
LOOP
-- first try to update the key
-- note that "a" must be unique
UPDATE db SET b = data WHERE a = key;
IF found THEN
...
Tablet or Phone - Android
...
123
As it has been mentioned before, you do not want to check whether the device is a tablet or a ...
adb not finding my device / phone (MacOS X)
...w on port 5037 *
* daemon started successfully *
List of devices attached
123ABC456DEF001 device
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Why not infer template parameter from constructor?
... infer template parameters from class constructors, much as it can do from function parameters? For example, why couldn't the following code be valid:
...
How to force a Solution file (SLN) to be opened in Visual Studio 2013?
...
123
The .sln file indicates the intended version as one of the early lines - for example:
Microso...