javascript - Regex from jQuery source -

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i understand of regex not | @ end of each parenthesis. know can used (a(b|c)). match both ab , ac. if in [] match actual symbol "|". me understand this. 

// used matching numbers core_pnum = /[+-]?(?:\d*\.|)\d+(?:[ee][+-]?\d+|)/.source

(?:\d*\.|) means

a non-capture group contains 0 or more digits followed dot or nothing @ all.

it rewritten like:

(?:\d*\.)?

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