Steve Calla (he/him) stevecalla

REGEX TUTORIAL

REGEX is short for regular expression. A regular expression is way to search for a sequence of characters or a character pattern in a body of text. REGEX uses a search pattern that can be difficult to understand but can find multiple instances of a character pattern throughout a text document.

For example, if I want to find a phone number in a body of text (such as a markdown document or javascript code or simply an article or word document), I can use a REGEX search pattern.

The following REGEX search pattern will find all phone numbers (e.g. 123-456-7899) that match this pattern of 3 digits followed by a "-" followed by 3 digits followed by a "-" followed by 4 digits. The REGEX to do so is

REGEX = "\d{3}-\d{3}-\d{4f}"

	// Port, host and auth token of Redis server might be defined as environment
	// variables. If not, fall back to defaults.
	var redisPort = process.env.REDIS_PORT \|\| 6379,
	redisHost = process.env.REDIS_HOST \|\| '127.0.0.1',
	redisAuth = process.env.REDIS_AUTH \|\| null,
	redis = require('redis');

	// Since we are waiting for the error event, we don't have to check for errors
	// individually after each Redis command.
	var onError = function (error) {