Question

正则表达式表示字母+数字+多个下划线该怎么写？

比如aaaaa_bbbbbb_ccccccccc，用正则该怎么写？又比如，aaaAAA1234234该怎么写？

Answer 1

a{5}_b{6}_c{9} #如果不要相同字母就这样：\w{5}_\w{6}_\w{9}

a{3}A{3}[0-9]+ #或者\w+\d+

Answer 2

[a-zA-Z\d_]+ , [a-zA-Z\d]+

Answer 3

[a-zA-Z\d_]+ , [a-zA-Z\d]+