what is the best way to remove non numeric characters from the beginning of a string?

In Javascript, what is the be开发者_C百科st way to remove non numeric characters from the beginning of a string?

-_1234d5fr

should ideally turn into

1234d5fr

str = str.replace(/^\D+/, '');

• regular-expressions.info/Character Classes, Anchors, and Repetition
  • \D stands for non-digit characters
  • The caret ^ matches the position before the first character in the string
  • + is "one or more of"

How about...

str = str.replace(/^[^0-9]+/, '');