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Regular expression for letters, numbers and - _
I'm having trouble checking in PHP if a value is is any of the following combinations
6 Answers
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Regular expression for a hexadecimal number?
...
If you're using Perl or PHP, you can replace
[0-9a-fA-F]
with:
[[:xdigit:]]
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What's the rationale for null terminated strings?
...implementation, no hidden indirection, no hidden integer.
no hidden memory allocation involved (well, some infamous non
standard functions like strdup
perform allocation, but that's mostly
a source of problem).
no specific issue for small or large hardware (imagine the burden to
manage 32 bits prefi...
How to read a file into a variable in shell?
...e variable in echo "$value". Otherwise, the shell will perform whitespace tokenization and wildcard expansion on the value.
– tripleee
Feb 4 '16 at 13:12
4
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.Net HttpWebRequest.GetResponse() raises exception when http status code 400 (bad request) is return
...tringBuilder msg = new StringBuilder();
msg.AppendLine("POST /o/oauth2/token HTTP/1.1");
msg.AppendLine("Host: accounts.google.com");
msg.AppendLine("Content-Type: application/x-www-form-urlencoded");
msg.AppendLine("Content-Length: " + contentAsBytes.Length.ToString());
msg.Appe...
How to display Base64 images in HTML?
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If you have PHP on the back-end, you can use this code:
$image = 'http://images.itracki.com/2011/06/favicon.png';
// Read image path, convert to base64 encoding
$imageData = base64_encode(file_get_contents($image));
// Format the image...
void in C# generics?
...oks like a zero-tuple. As of the current version of C#, you cannot use the tokens () in code to get an instance. You can use default(ValueTuple) or just default (when the type can be inferred from the context) instead.
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Can I list-initialize a vector of move-only type?
...&... items) {
typedef std::unique_ptr<T> value_type;
// Allocate memory for all items
std::vector<value_type> result(sizeof...(Items));
// Initialize the array in place of allocated memory
new (result.data()) value_type[sizeof...(Items)] {
make_unique<...
typecast string to integer - Postgres
...ing into an integer.
Solution
Create a user-defined function inspired by PHP's intval() function.
CREATE FUNCTION intval(character varying) RETURNS integer AS $$
SELECT
CASE
WHEN length(btrim(regexp_replace($1, '[^0-9]', '','g')))>0 THEN btrim(regexp_replace($1, '[^0-9]', '','g'))::intege...
writing some characters like '
...t; on android axml since &lt and &gt still not recognized as valid token
– jace
Jan 5 '18 at 2:48
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