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May it be for truncating a string, searching for a substring or locating the presence of special characters. The regexp functions available in Oracle 10g can help us achieve the above tasks in a simpler and faster way. I have tried to illustrate the behavior of the regexp functions with common patterns and description of each. This document mainly focuses on the usage of patterns. The patterns can be used with any of the regular expression functions.
But before we start let me include little oracle documentation. I hope the documentation is good enough to start with. Okay let’s start with our first case. In the above example we tried to check if the source string contains only lower case alphabets with a string length varying from minimum of 3 to max of 12. It’s because we are not concerned beyond the 4th character and hence we need not mark the end of the string.
In the source string we wanted to search for multiple spaces anywhere in the string. I wanted to search for the matching pattern anywhere in the source string. By default the first matching pattern is returned. Note the extra parameters in the expression compared to the first example. In the above example, there is no matching pattern in the source string and hence the output is null. In the above example we tried to extract the digits at the end of the source string.
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The above example extracts the name part from email address. We looked for the second occurrence of alpha numeric characters in the source string which is 231. Don’t we find the output misleading here? Now let’s move to our next case. The parentheses help in grouping expressions together to represent one sub expression. Now that we have understood sub expressions we can move ahead with the rest of the pattern.
Did you notice the backslash before the dot? The backslash here is used as escape sequence for dot. The above pattern can also be used to validate phone numbers with little customization. Let’s try to search for two consecutive occurrences of letters from a-z in the following example. Now let’s try to search for three consecutive occurrences digits from 6 to 9 in the following example.
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