Regular expression in java for validating numbers
With all of this in mind, let’s look at the regular expression again after breaking it into its pieces. : # Group but don't capture: [0-9] # Match a digit. ITU-T Recommendation E.123 (“Notation for national and international telephone numbers, e-mail addresses and web addresses”) can be downloaded at Because this version is written using free-spacing style, the literal space character has been replaced with ^ # Assert position at the beginning of the string. ITU-T Recommendation E.164 (“The international public telecommunication numbering plan”) can be downloaded at RFC 5733 defines the syntax and semantics of EPP contact identifiers, including international phone numbers. Techniques used in the regular expressions in this recipe are discussed in Chapter 2. Make sure to be in global mode (g flag), case insensitive and to have the dot all option on.This regular expression will match all HTML tags and their attributes.The regular expression in java defines a pattern for a String. Pattern Example.main(Pattern Example.java:13) So if your requirement is just to check if the input String matches with the pattern, you should save time and lines of code by using simple String matches method.Regular Expression can be used to search, edit or manipulate text. You should use Pattern and Matches classes only when you need to manipulate the input String or you need to reuse the pattern.This free Java regular expression tester lets you test your regular expressions against any entry of your choice and clearly highlights all matches. Consult the regular expression documentation or the regular expression solutions to common problems section of this page for examples. You can create range of characters using the hyphen character such as A-Z (A to Z).
Fortunately, there is a simple, industry-standard notation specified by ITU-T E.123. This regular expression follows the international phone number notation specified by the Extensible Provisioning Protocol (EPP).Consult this page for more details on this problem. For the actual date validity, you should rely on another language.The following expressions will validate the number of days in a month but will NOT handle leap year validation; hence february can have 29 days every year, but not more. A SIN should also be validated by computing the checksum digit.Thanks to the international phone numbering plan (ITU-T E.164), phone numbers cannot contain more than 15 digits. The significance of this is that EPP-style international phone numbers are increasingly used and recognized, and therefore provide a good alternative format for storing (and validating) international phone numbers.
The shortest international phone numbers in use contain seven digits. EPP-style phone numbers use the format Recipe 4.2 provides more options for validating North American phone numbers. Recipe 2.1 explains which special characters need to be escaped.