10. 三、string模块string.upper("test")全部大写
string.split("c:\\test","\\")分割
string.join(("a", "b", "c"),"/")组合
string.find("this is test","is")查找最小
string.rfind("this is test","is")查找最大
string.strip("this is t", "t")去除
...
11. 四、re模块常用功能:
re.match Match a regular expression pattern to the beginning of a string.
re.search Search a string for the presence of a pattern.
re.sub Substitute occurrences of a pattern found in a string.
re.subn Same as sub, but also return the number of substitutions made.
re.split Split a string by the occurrences of a pattern.
re.findall Find all occurrences of a pattern in a string.
