Validating a phone number with regex
Consider a flat-file source Employee which contains employee details including the Phone Number. You can search for words of a certain size. The following method may still be used for that approach, but it is a powerful tool intended to validate phone numbers from sources that are well beyond control. Area code should not start with 0. In fact, you cannot trust that there is a browser at all. The learning curve for Regular expression may not be very easy for everyone. Specifications PowerCenter version 9. Comments Overview Regular expressions provide the foundation for describing or matching data according to defined syntax rules.
At the same time, Regular expression can be very confusing and tricky. If we wanted to do that, we could create three or four form fields one for each element and restrict the length of those fields. This includes , , , , , and many more even including formats with extensions. Consider a flat-file source Employee which contains employee details including the Phone Number. Client-side validation may work for users who are following the proper means to enter data, but malicious hackers may send POST data through non-traditional means not a browser. Using regular expressions validate the Phone Number of every employee record according to US standards and load the valid records into the target table. The following method may still be used for that approach, but it is a powerful tool intended to validate phone numbers from sources that are well beyond control. Thus, performing validation on the server-side adds an extra layer of security to your application. So, what is a programmer to do? The Phone Numbers must be of the following format: Without turning this into a tutorial on the syntax of regular expressions, allow me to briefly examine each element of this expression. Follow me as I take a look at validating user-entered data in this first installment of what I hope to be a continuing series. I simply cannot trust a person or a text file of data that was entered by a person to enter data in the correct format that I require. Often this results in to underutilization of Regular Expression and true power is not harnessed. The expression looks like this: You can search Numbers, punctuation characters, patterns and so on. Using Regular Expressions, it is simple to search for a specific word or string of characters. Almost every editor on every computer system can do this. The records with invalid Phone Numbers must be handled appropriately. Comments Overview Regular expressions provide the foundation for describing or matching data according to defined syntax rules. She must validate her data. Area code may be optionally enclosed in round brackets. I have no control over the phone number formats in the file, but I want to read the phone numbers, validate them against my regular expression, and break them up them into their individual components area code, exchange, number, and extension. As simple as or for example. There are two places to validate data: In both situations, the data that the application gathers is unreliable at best.
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