JSF2验证器正则表达式

Question

I am using following regex validator, i want validation error on whitespace if entered only and allowed chars from list az and AZ and _ and 'whitespace' and 0-9

Currently i have having problem with this exp it is not allowing white spaces in b/w nor in the begning.

<f:validateRegex pattern="^\s[a-zA-Z\s_0-9]+"/>

please any quick suggestion appriciated

for example.

" " (When user pass empty string it should fail)
" Abc hello" (It should pass)
"Hello world" (It should pass)

Answer 1

尝试这个：

^[a-zA-Z\s_0-9]+\b\s*$