Download Beginning Regular Expressions (Programmer to Programmer) by Andrew Watt PDF

By Andrew Watt

* Supported by means of all significant databases, scripting languages, and programming languages, normal expressions are robust "wild-card" text-processing instruments utilized by programmers to discover, validate, regulate, or edit info * overlaying quite a lot of languages and databases-including JavaScript, ASP.NET, and Access-this e-book will entice the numerous programmers do away with via the Perl-Unix concentration of current commonplace expressions books * filled with easy-to-follow examples and workouts, the e-book is helping general expressions novices research by way of doing

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Extra resources for Beginning Regular Expressions (Programmer to Programmer)

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23 Chapter 2 To make use of wildcard functionality in Microsoft Word, use the keyboard shortcut Ctrl+F to open the Find and Replace dialog box. By default, search functionality in Word simply uses literal text for search. Turn on the wildcard functionality by checking the appropriate check box. To access that check box you need to click the More button in the Find and Replace window (see Figure 2-3, which shows its appearance in Word 2003). Figure 2-3 Further options are then displayed in the Find and Replace dialog box.

If you want to check the supposed SSN client side, you could use JavaScript and its RegExp object to check whether a string entered by a user conforms to a pattern that is a valid SSN. One of the reasons for checking input from Web forms is that the data collected will be sent to a database, likely a relational database. If the wrong datatype is entered in a field in a form, you might end up with an attempt being made to enter a name into a date column in the database, which will likely cause an error when the attempt is made to write the data to the database.

To conclude this chapter, take a look at a problem that you might be faced with and for which regular expressions, correctly used, could be very useful. Replacing Text in Quantity One use of regular expressions is to replace quantities of text, possibly across many thousands of documents. Things can very easily go wrong if you don’t understand what you are doing, as the following simple example shows. Imagine that you have just joined the fictional Star Training Company as a summer intern. Just before you start with the company, someone decides that Star Training Company should become the equally fictional Moon Training Company, possibly as a result of a recent takeover or change in corporate focus.

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