后发现封信,我想编写使用的Unix命令,正则表达式识别所有字符串不确认以下格式正则表达式下划线
First Leter is UpperCase
Followed by any number of letters
Underscore
Followed by UpperCase Letter
Followed by any number of letters
Underscore
and so on .............
下划线的数量是可变的
So valid ones are Invalid ones are
Alpha_Beta_Gamma alph_Beta_Gamma
Alpha_Beta_Gamma_Delta Alpha_beta_Gamma
Alppha_Beta Alpha_beta
Aliph_Theta_Pi_Chi_Ming Alpha_theta_Pi_Chi_Ming
“A_B_C”有效还是无效? “ABC”呢? 'Abc'? 'AB_CD'?空的字符串? – 2010-09-08 13:51:24
A_B_C有效ABC无效Abc也无效,AB_CD无效应该是Ab_Cd – lisa 2010-09-08 14:05:16