javascript - Regex validation for "no spaces" -

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i have tried:

self.username = ko.observable(data.username || null)     .extend({ required: true, maxlength: 50 })     .extend({ pattern: { message: 'username cannot contain spaces.', params: '^\s*$' } });

and

self.username = ko.observable(data.username || null)     .extend({ required: true, maxlength: 50 })     .extend({ pattern: { message: 'username cannot contain spaces.', params: '[\s]' } });

but validation error flagged value of "a".

the expression '^\s*$' seems work on on-line javascript regex testers. not sure why flagging.

when using string define regular expression, need escape backslashes, should be:

self.username = ko.observable(data.username || null)    .extend({ required: true, maxlength: 50 })    .extend({ pattern: { message: 'username cannot contain spaces.', params: '^\\s*$' } });

if use regular expression literal instead of string, don't need escape backslash:

self.username = ko.observable(data.username || null)    .extend({ required: true, maxlength: 50 })    .extend({ pattern: { message: 'username cannot contain spaces.', params: /^\s*$/ } });

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