ng-pattern for angularjs wrong behaviour

Question

i am trying to work with ng-pattern but it throw an error. i want to validate a duration of time with the follwing pattern :

((?:(?:[0-1][0-9])|(?:[2][0-3])|(?:[0-9])):(?:[0-5][0-9])(?::[0-5][0-9])?(?:\\s?(?:am|AM|pm|PM))?)

but i have this error :

Lexer Error: Unexpected next character at columns 76-76 [] in expression [((?:(?:[0-1][0-9])|(?:[2][0-3])|(?:[0-9])):(?:[0-5][0-9])(?::[0-5][0-9])?(?:\s?(?:am|AM|pm|PM))?].

it seems that i have problem with back slash but what i know that if i want escaping back slash i have to make two back slash "\". the version of angularjs is 1.2.rc2

Wilt · Accepted Answer · 2014-04-07 15:46:35Z

1

You are actually escaping a white space character. \s is a white space character in a regular expression so by doing \\s you are escaping the white space expression and because of this you are searching for a slash followed by an s: \s

What you might need is an extra closing bracket somewhere there...

answered Apr 7, 2014 at 15:46

Wilt

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2 Comments

ziedTn Over a year ago

the problem that i have generate the expression from a generator online and i have test it on this site : link and it works fine.

Wilt Over a year ago

It says in the explanation: "\\ matches the character \ literally s? matches the character s literally (case sensitive)" Because it matches zero or one times you get a match. But you don't want to search at all for a slash and a s

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