rebol 笔记: 字符串处理函数
跳转
first / second
myblock/3 相当于 pick myblock 3
next / back
head / tail
at myblock 3 指针跳转到第3个元素前面
skip myblock 3 指针往前跳过3个元素，指到第4个元素前面，->
如果skip myblock -3 就是往后跳过3个元素，<-
修改
insert mystring “add to head”
append mystring “add to tail”
change 修改myblock为指定内容，与perl中的substr有相通之处
>> myblock: [the quick brown fox]
== [the quick brown fox]
>> myblock: next myblock
== [quick brown fox]
>> change/part myblock [black] 2
== [fox]
>> head myblock
== [the black fox]