What does the underscore mean in the following regex?
[a-zA-Z0-9_]
The _ seems to make no difference so I don't understand the purpose of it.
What does the _ in [a-zA-Z0-9_] mean?
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What does the underscore mean in the following regex?
[a-zA-Z0-9_]
The _ seems to make no difference so I don't understand the purpose of it.