javascript - What is the meaning of '|e' in RegExp -

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in line below, purpose of '|e'? tried looking couldn't find it, , line still it's supposed when isn't there.

pattern = /([\+|\-]?[\d]+[\.][\d|\-|e]+)[ ]+([\+|\-]?[\d]+[\.][\d|\-|e]+)[ ]+([\+|\-]?[\d]+[\.][\d|\-|e]+)/g;

edit:

here sample of code parsing.

-3.424999 -0.855454 2.257396  -1.484919 0.665606 -3.151304  1.636841 -0.848154 -0.458954  3.732041 0.187906 -1.319734  -1.756719 0.682006 0.807596  0.911641 -0.828054 3.040696  -0.218059 -0.489374 -3.806524  -1.078099 0.891706 -2.420454

normally, | gives alternative options, (one|two) matches either 1 or two.

however putting | inside [] suggests doesn't understand how [] work (they match single instance of character within them - or range, [a-z] matches or b or c...

i suspect, unless have | within string matching, can remove of | occurences pattern , still work. it's difficult know more without seeing examples of kind of string should matching, , want capture.

(edit): have provided sample, if parsing that, use like

/([+-]?\d+\.\d+)\s([+-]?\d+\.\d+)\s([+-]?\d+\.\d+)/

if want able accept numbers of form 1.234e56 change 

/([+-]?\d+\.\d+(e[+-]?\d+)?)\s([+-]?\d+\.\d+(e[+-]?\d+)?)\s([+-]?\d+\.\d+(e[+-]?\d+)?)/

(the above assumes there decimal point)


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