What's wrong with this string?

[FlameInYourSide]

Code:

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str URLStrChars="! # $ % & ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ { | } ~"
str* usc=StringToArray(URLStrChars)
for(i 0 SA_Len(usc)) out usc[i]

All I get for output is: _

I just did a test and found that:
SA_Len(usc) = 1
Instead of 29.

I know that StringToArray and SA_Len work because I've tested them with other strings.

Note: For those who don't know, StringToArray and SA_Len are from elsewhere in this forum by Gintaras.

[Gintaras]

By default, all these characters except _ are delimiters. Specify space as second argument.

str* usc=StringToArray(URLStrChars " ")