About the syntax of regular expression
I found a piece of code that accidentally outputs strange and inefficient regular expressions such as a(a|a)b which gets an a|a (two identical expressions connected by |) Is such expression syntactically right? I can easily fix it, but I just want to know whether such expressions are valid or not, because this one seems bugs-free so far.
Yep, this is syntactically equivalent to the regex /a(a)b/ - just slower.
What the regex a(a|a)b indicates is, And the regex aab indicates And both will matches the input aab
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