The FILTER_VALIDATE_REGEXP constant validates a value against a Perl-compatible regular expression. Options regexp − The regular expression to validate against. Return The FILTER_VALIDATE_REGEXP constant does not return anything. Example Live Demo The following is the output. Matched String!

C++11 is a version of standard C++ language. It was approved by International Organization for Standardization (ISO) on 12 August 2011 then C++14 and C++17. C++11 makes several additions to the core language. Visual C++ implements the vast majority of features in C++11. Some of the following C++11 features in ... Read More

In Python, if we want to limit the large amount of data from displaying, we can use the reprlib module. To use this module, we should import it using. import reprlib There are different classes and methods related to reprlib. These are − Class reprlib.Repr The Repr class ... Read More

The Pseudo-terminal utility module pty is defined to handle pseudo-terminal concepts. Using this we can start another process, and also can read or write from controlling terminal using programs. This module is highly platform oriented. We should use UNIX systems to perform these operations. To use the pty module, we ... Read More

To get the UNIX syslog library information, we need to use the syslog module into our programs. This module has syslog has different modules for the syslog library. To use this module, we should import it using − import syslog The methods are like below − Method syslog.syslog(message) ... Read More

We can achieve possible enum value with the help of ‘enum’. The following is the syntax. yourColumnName ENUM(value1, value2, ........................N) Let us first create a table. mysql> create table EnumDemo -> ( -> Light int, -> IsONOrOff ENUM('ON', ... Read More

ReaderWriterLock synchronize access to a resource. A ReaderWriterLock has better throughput than a Monitor, which is one-at-a-time lock. This works for a situation when a resource is changed rarely. Let us see how to declare a ReaderWriter lock in C# − static ReaderWriterLock r = new ReaderWriterLock(); ... Read More

Spinner is just like a drop down button, using this button we can select a item from set of items. This example demonstrate about how to add items to a spinner in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill ... Read More

A literal is a source code representation of a fixed value. They are represented directly in the code without any computation. Literals can be assigned to any primitive type variable. For example. byte a = 68; char a = 'A'; byte, int, long, and short can be expressed ... Read More

The maximum length of a table name is 64 characters long according to MySQl version 8.0.12. Check your installed MySQL version. mysql> select version(); The following is the output. +-----------+ | version() | +-----------+ | 8.0.12 | +-----------+ 1 row in set (0.03 sec) ... Read More