Question

What is the result of the function that follows? regexp_substr('tr1-268-468r', '[1-9]-[1-9]*[a-z]')

Answer 1

The result of the given function is '1-268-468r'. The regular expression pattern matches the first substring in the input string that follows the specified pattern.

Step-by-step explanation:

The regexp_substr function in the question extracts a substring from the given string that matches the regular expression pattern provided. The pattern '[1-9]-[1-9]*[a-z]' is looking for a sequence that starts with a digit between 1 and 9, followed by a hyphen, then zero or more digits from 1 to 9, and finally a lowercase letter from 'a' to 'z'. The result of the given function is '1-268-468r'.

1. First, let's break down the regular expression pattern: [1-9]-[1-9]*[a-z].
2. [1-9] matches any digit from 1 to 9.
3. - matches a hyphen.
4. [1-9]* matches zero or more digits from 1 to 9.
5. [a-z] matches any lowercase letter from a to z.
6. regexp_substr searches for the first occurrence of the pattern within the given string.
7. Therefore, regexp_substr('tr1-268-468r', '[1-9]-[1-9]*[a-z]') returns '1-268-468r' as the first substring in the input string that matches the pattern.