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Test if string is a number in Ruby on Rails
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Create is_number? Method.
Create a helper method:
def is_number? string
true if Float(string) rescue false
end
And then call it like this:
my_string = '12.34'
is_number?( my_string )
# => true
Extend String Class.
If you want to be able to call is_number? directly on the string...
Get folder name from full file path
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See DirectoryInfo.Name:
string dirName = new DirectoryInfo(@"c:\projects\roott\wsdlproj\devlop\beta2\text").Name;
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Java String remove all non numeric characters
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Try this code:
String str = "a12.334tyz.78x";
str = str.replaceAll("[^\\d.]", "");
Now str will contain "12.334.78".
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How to filter by IP address in Wireshark?
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Match destination: ip.dst == x.x.x.x
Match source: ip.src == x.x.x.x
Match either: ip.addr == x.x.x.x
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Get IP address of visitors using Flask for Python
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from flask import request
from flask import jsonify
@app.route("/get_my_ip", methods=["GET"])
def get_my_ip():
return jsonify({'ip': request.remote_addr}), 200
For more information see the Werkzeug documentation.
sh...
Useful GCC flags for C
... not occur. (The value 5 may be too strict, see the manual page.)
-Wwrite-strings: give string constants the type const char[length] so that copying the address of one into a non-const char * pointer will get a warning.
-Waggregate-return: warn if any functions that return structures or unions are ...
Android: Test Push Notification online (Google Cloud Messaging) [closed]
...an send both GCM and APNS notifications and also support JSON messages for extra arguments. Following are the links to the testers.
GCM Tester
APNS Tester
Please let me know if you have any questions or face issues using it.
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What is the difference between const int*, const int * const, and int const *?
... but not the value that you point to. Most often this is seen with C-style strings where you have a pointer to a const char. You may change which string you point to but you can't change the content of these strings. This is important when the string itself is in the data segment of a program and sh...
Show MySQL host via SQL Command
...ink you try to get the remote host of the conneting user...
You can get a String like 'myuser@localhost' from the command:
SELECT USER()
You can split this result on the '@' sign, to get the parts:
-- delivers the "remote_host" e.g. "localhost"
SELECT SUBSTRING_INDEX(USER(), '@', -1)
-- deli...
How to replace part of string by position?
I have this string: ABCDEFGHIJ
18 Answers
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