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1. ^/d+$//matching nonnegative integer (positive integer + 0)2. ^[0-9]*[1-9][0-9]*$//Matching positive integer3. ^ ((-/d+) | (0+)) $//matching non positive integer (negative integer + 0)4. ^-[0-9]*[1-9][0-9]*$//matching negative integers5.

The traditional database management system puts all the data on disk for management, so it is called a disk database (drdb:disk-resident). The disk database requires frequent access to the disk for data manipulation, and the disk reads and writes

Index1.B Tree Index (b-tree)B-Tree index is the most commonly used in our daily work index, everyone usually said in the job "index" by default is a B-tree index;The index is very simple, it is easy to understand, with a book directory to describe

It has been used for more than two years, and the manual has been flipped over. Although now not how to use vim, once the notes are posted out, and like vim friends to share.1. About VIMVim is my favorite editor and the second most powerful editor

String function learning Summary In Python3.2, python3.2 string Sequence Types There are six sequence types: strings, byte sequences (bytes objects), byte arrays (bytearray objects), list, tuple, range objects. Common operations supported by

1. Basic data types(1) Number-int(2) string-str(3) Boolean value-bool2. Important methods in the INT type(1) INTTo convert a string to a numeric type:# Converts a string of byte numbers to an int type# Converts a string of byte numbers to int type a

Network Connectivity1. Important terminologies 1) Link Device connection. The link itself can be wired or wireless. 2) node device. Computers, laptops, and mobile phones can all be node. 3) point-to-point only connects two devices. 4) more than two

Original article address: Two good Vim skillsAuthor: Liurhyme Note the following before reading this article:1. The goal of this article is to provide some Vim usage skills, which can improve the efficiency of VIM operations. Some tips can also be

Note the following before reading this article:1. The goal of this article is to provide some Vim usage skills, which can improve the efficiency of VIM operations. Some tips can also be used on VI, but now Vim is basically used.2. this article

Sequence Types There are six types of sequence: strings, byte sequences (bytes objects), byte arrays (ByteArray objects), list, tuple, Range objects. Common operations supported by sequence types:Member check: in, not inConnection: +Copy: