JavaScript Tutorial - Tools for writing regular expressions

Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/01/tools-for-writing-regular-expressions.html Healthy diet is very important both for the body and mind. If you like Aarvi Kitchen recipes, please support by sharing, subscribing and liking our YouTube channel. Hope you can help. https://www.youtube.com/channel/UC7sEwIXM_YfAMyonQCrGfWA/?sub_confirmation=1 In this video we will discuss the basics of regular expressions and then look at some of the tools available to learn, write and test regular expressions. Basics of Regular Expressions Find the word expression in a given string. This will also match with the word expressions. expression To find the word "expression" as a whole word, include \b on either sides of the word expression \bexpression\b \d indicates to find a digit. To find a 5 digit number we could use the following \b\d\d\d\d\d\b We can avoid the repetition of \d by using curly braces as shown below. \d{5} means repeat \d 5 times. \b\d{5}\b The above example can also be rewritten as shown below. \b[0-9]{5}\b Find all the words with exactly 5 letters \b[a-zA-Z]{5}\b Brackets are used to find a range of characters [a-z] - Find any of the characters between the brackets [0-9] - Find any of the digits between the brackets. This is equivalent to \d (a|b) - Find any of the characters a or b The page at the following link explains the basics of regular expressions. https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions Expresso is one of the free tools available. Here is the link to download. http://www.ultrapico.com/ExpressoDownload.htm Regular Expression Library http://regexlib.com