I'm working with python and I'm doing a chat, I need to validate that if the user sends a code as follows:
Code 1: ZH150000001
Code 2: ZHS150000001
Validate if it starts with ZH or ZHS and what follows is a number.
I think that it could be with a regular expression but I'm not sure.
If so, do you know of any? or from an understandable regular expression generator?.
I appreciate your help.
You're right, a regular expression would validate this. For example, the following regular expression validates what you are saying
^ZHS?\d+$
I'll explain everything to you
^ZH This forces the text to start (this is marked with ^ ) with ZH
S? This indicates that the letter S is optional (may or may not come) \d+ means any digit, repeated 1 or more times (we have not set a limit) $ indicates that it is the end of the text read, you should not continue with more text behind. A quick example to test such regular expression in python would be:
re.match(r'^ZHS?\d+$', 'ZH150000001')
I forgot to comment, if this returns None , is that there has not been a match, if you return a reference, it is that if you have found it
The regular expression you're looking for is (ZHS?\d+) . I explain it to you in parts:
Parentheses delimit a segment to search. They are not strictly necessary but if they do not put them "match" they will not return what they find.
The letters are what they are, Z , then H and then S . The S is followed by an interrogation that means "0 or 1".
Then comes \d , which means "digit", that is, from 0 to 9. The% sign + that goes behind indicates that there must be a series of 1 or more.
On this page you can try your regular expressions in Python: link