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I Have a Question. I'm just learning regular expressions in a python class and I do not understand what [a-z0-9] means. Can someone explain what each part means? I was on Google but I only confused myself.
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The bracketed characters [a-zA-Z0-9] mean that any letter (regardless of case) or digit will match. The * (asterisk) following the brackets indicates that the bracketed characters occur 0 or more times.
[a-zA-Z0-9. _-:\?] means it can be among the all the Uppercase and lowercase letters and the number betwween 0 and 9, and the letter.
A regular expression, also known as regex, is a pattern that represents a collection of strings that match the pattern. To put it another way, a regex only accepts a specific set of strings while rejecting all others.
The subexpression/metacharacter “\Z” matches the end of the entire string except allowable final line terminator.
In a regular expression, if you have [a-z] then it matches any lowercase letter. [0-9] matches any digit. So if you have [a-z0-9], then it matches any lowercase letter or digit.
You can refer to the Python documentation for more information, especially in the chapter 6.2-Regular Expression operations
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