精度為2的十進制的簡單正則表達式精度為2的十進制的正則表達式是什么？有效實例:123.1225675492929292929292.120.213.1無效示例：12.12322.23332e666.76小數點可以是可選的，整數也可以包括在內。
3 回答
冉冉說
TA貢獻1877條經驗 獲得超1個贊
^[0-9]+(\.[0-9]{1,2})?$^ # Start of string
[0-9]+ # Require one or more numbers
( # Begin optional group
\. # Point must be escaped or it is treated as "any character"
[0-9]{1,2} # One or two numbers
)? # End group--signify that it's optional with "?"
$ # End of string[0-9]\d[0-9]
import re
deci_num_checker = re.compile(r"""^[0-9]+(\.[0-9]{1,2})?$""")valid = ["123.12", "2", "56754", "92929292929292.12", "0.21", "3.1"]
invalid = ["12.1232", "2.23332", "e666.76"]assert len([deci_num_checker.match(x) != None for x in valid]) == len(valid)assert
[deci_num_checker.match(x) == None for x in invalid].count(False) == 0- 3 回答
- 0 關注
- 684 瀏覽
添加回答
舉報
0/150
提交
取消