javascript - RegEx: non-consecutive special characters only allowed in the middle -

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i using following ng-pattern="/^[a-za-z][a-za-z0-9._](.*[a-za-z0-9])?$/"

the matching string should

  • not start special character,
  • not end special character, and
  • not include consecutive symbols except . (dot) , _ (underscore).

but not working. please, suggestion.

try using word character class start ([\w] = [a-za-z0-9_]):

i'm not sure mean consecutive symbols. might help:

/^[a-za-z]([\w.]*[a-za-z0-9])?$/

maybe, have @ javascript regexp reference


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