1.匹配字符串中的数字、字母和下划线
str = "hello_+asdf2312+887441a+asdf"
table = {}
string.gsub(str, "([%w_]+)",
function(w)
table.insert(table,w)
end
end
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2.替换字符串中的指定字符
str = "hello,john"
s = string.gsub(str, "john", "james")
s ==>"hello,james"
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3.判断字符串中是否有目标字串
str = "hello,john"
start, end = string.find(str, "hello")
start ==>1
end ==>5
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4.从文件的绝对路径中获取到文件名
fn_flag = string.find(filename, "\\")
if fn_flag then
dest_filename = string.match(filename, ".+\\([^\\]*%.%w+)$")
end
fn_flag = string.find(filename, "/")
if fn_flag then
dest_filename = string.match(filename, ".+/([^/]*%.%w+)$")
end
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5.去掉字符串中括号内的内容，并去掉收尾的空格
str = " helloa,ni hao (asdfasdf) "
newstr = string.gsub(str,"%b()","")
newstr = string.gsub(newstr, "^%s*(.-)%s*$", "%1")
print(newstr)---->helloa,ni hao
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