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How can I validate a string to only allow alphanumeric characters in it?
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In .NET 4.0 you can use LINQ:
if (yourText.All(char.IsLetterOrDigit))
{
//just letters and digits.
}
yourText.All will stop execute and return false the first time char.IsLetterOrDigit reports false since the contract of All cannot be fulfilled then.
Note! this answer do ...
MYSQL Truncated incorrect DOUBLE value
...in user and 36 char guids for all other users. My where was specifying the user_id as 1, without the quotes. I think this is related to mysql being in strict mode.
– dmulvi
Apr 25 '13 at 22:49
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Convert camelCaseText to Sentence Case Text
...Case() + result.slice(1);
console.log(finalResult);
capitalize the first letter - as an example.
Note the space in " $1".
EDIT: added an example of capitalization of the first letter. Of course, in case the first letter is already capital - you would have a spare space to remove.
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Difference between 'new operator' and 'operator new'?
...'s a good question in any case.
Operator new is a function that allocates raw memory -- at least conceptually, it's not much different from malloc(). Though it's fairly unusual unless you're writing something like your own container, you can call operator new directly, like:
char *x = static_cast&...
Convert integer into its character equivalent, where 0 => a, 1 => b, etc
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Assuming you want lower case letters:
var chr = String.fromCharCode(97 + n); // where n is 0, 1, 2 ...
97 is the ASCII code for lower case 'a'. If you want uppercase letters, replace 97 with 65 (uppercase 'A'). Note that if n > 25, you will get out...
Random strings in Python
...) lowercase characters:
import random, string
def randomword(length):
letters = string.ascii_lowercase
return ''.join(random.choice(letters) for i in range(length))
Results:
>>> randomword(10)
'vxnxikmhdc'
>>> randomword(10)
'ytqhdohksy'
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How do I capitalize first letter of first name and last name in C#?
Is there an easy way to capitalize the first letter of a string and lower the rest of it? Is there a built in method or do I need to make my own?
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IN clause and placeholders
...this,"whereIdsList: "+ids);
final String whereClause = Tables.Contacts.USER_ID + " IN ("+ids+")";
final ContentValues args = new ContentValues();
args.put(Tables.Contacts.GROUP_ID, groupId);
int numberOfRowsAffected = 0;
SQLiteDatabase db = dbAdapter.getWritableDatabase());
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Pointers, smart pointers or shared pointers? [duplicate]
...hat it is in charge of deleteing it at some point. They allow you to get a raw reference to the pointer they wrap for passing to other methods, as well as releasing the pointer, allowing someone else to own it. Copying them does not make sense.
Shared pointers is a stack-allocated object that wraps ...
Sending images using Http Post
...<String, String> map = new HashMap<String, String>();
map.put("user_id", String.valueOf(userId));
map.put("action", "update");
url = addQueryParams(map, url);
HttpPost post = new HttpPost(url);
post.addHeader("Accept", "application/json");
MultipartEntityBuilder builder = MultipartEnti...