Javascript Question
Regex for set of Hashtags
I need a regular expression for validating one or more hashtags. Each hashtag should start with hash ("#") and ends with comma or space.
These are the valid inputs:
#hashtagTest#hashtagTest1, #hashtagTest2#hashtagTest1,#hashtagTest2I've been trying to do this in javascript but with no success so far.
These are invalid inputs:
#hashtagTest hashtagTest#hashtagTest#hashtagTest
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Answer Source
This one will work
/(#[a-zA-Z0-9]+,? *)*#[a-zA-Z0-9]+/
See the explanation and test it here https://regex101.com/r/0NJkgq/2
You might want to add begin and end of line markers to make sure the whole string is a sequence of tags
/^(#[a-zA-Z0-9]+,? *)*#[a-zA-Z0-9]+$/
If you want to find all the occurrences of sequences of tags in a string you can use
/(#[a-zA-Z0-9]+,? *)*#[a-zA-Z0-9]+/g
The g modifiers allows to find all the occurrences of the regexp in a string
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