Always ensures that a string starts with a specific substring.This function is valid in v2.0.0 to v2.14.2. This function has been downloaded 2 times.
nullwill cause a partial function to be returned.
strif it needs to be added.
strPrefixwill be prepended to the beginning of it.
stris not given a partial function will be returned which will await the string value of
opt_rgxTesterisn't given, the
strwill be returned and it will be prefixed with
strPrefixif it isn't already at the beginning of it. If
opt_rgxTesteris given and
strtests negative against it
strPrefixwill be returned. Otherwise
strwill be returned.