regex - RegExp (^|\\?|&) in javascript -


could please me understand javascript regexp :

cbreg = new regexp('((^|\\?|&)' + cbkey + ')=([^&]+)') // cbkey string

i confused (^|\\?|&) portion. mean?

thanks !

well first of given regex created string literal double backslashes become single backslash in resulting regex (because that's how escaping works in string literal):

(^|\?|&)

the | means or, have:

^    - start of line, or \?   - question mark, or &    - ampersand

a question mark on own has special meaning within regex, escaped question mark matches actual question mark.

the parentheses means matches 1 of choices before matching next part of regex. without parens third choice include next part of expression (whatever in cbkey).


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