Download e-book for iPad: Introducing Regular Expressions: JavaScript and TypeScript by Jörg Krause

By Jörg Krause

ISBN-10: 1484225074

ISBN-13: 9781484225073

ISBN-10: 1484225082

ISBN-13: 9781484225080

This ebook is your easy-to-digest and concise advisor to standard expressions in JavaScript, this ebook teaches you the very fundamentals and will be utilized in the browser or at the server. discover and know how to exploit normal expressions in all JavaScript environments.
Presented in 4 key notion sections, Introducing typical Expressions indicates easy methods to create and use average expressions to speed up your JavaScript development.
What you will Learn

  • What general expressions are and why you can use them
  • Use helpful expressions (including examples)
  • Reference positive factors and functions
  • Use average expressions in all JavaScript environments

Who This booklet Is For
Developers of net functions who are looking to discover the services of JavaScript dependent apps on either, customer and server. It’s compatible for newcomers that experience a easy knowing of JavaScript already.

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Extra resources for Introducing Regular Expressions: JavaScript and TypeScript

Example text

0-9]+ Using the * makes everything before the decimal point optional. 6”, which is probably fine, although odd. 7e5 or 22eˆ10. $) Credit Cards Credit cards have a very regular structure and are handled well by regular expressions. $ All Visa numbers start with “4 and have 16 digits. • MasterCard: ˆ5[1-5][0-9]{14}$ All MasterCard numbers start with 51 to 55 and are 16 digits. 39 Chapter 4 ■ Examples of Patterns • American Express: ˆ3[47][0-9]{13}$ American Express starts with 34 or 37 (Gold) and have 15 digits.

So things are going to get complex. To make it right, taking a look at the Internet standard’s definition is a good idea. For email, it’s the RFC 5322. :[a-z0-9-]*[a-z0-9])? [0-9][0-9]? :[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f] | \\[\x01-\x09\x0b\x0c\x0e-\x7f])+) \]) The @ sign purposefully splits the expression into two parts. It also includes checking for an IP address. That’s rarely used but perfectly valid. For the name, another odd part is acceptable. The " and \ characters are valid if there is a backslash beforehand.

Manipulating Data JavaScript’s replace function supports regular expressions directly. That’s the common way to change data based on search patterns. Remove Spaces Spaces can be removed quite easily. Try searching for ˆ[ \t]+ and replace the spaces with nothing. If you look for the spaces at the end, use this: [ \t]+$. If you want to remove spaces at the beginning and the end, use this: ˆ[ \t]+|[ \t]+$. Instead of declaring all space chars individually, such as in [ \t] (space and tab only), you can even add more, such as line breaks: [ \t\r\n].

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Introducing Regular Expressions: JavaScript and TypeScript by Jörg Krause

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