regex - 检查每个单词的第一个字符是否为大写

Question

我想检查字符串中每个单词的第一个字符是否为大写。其他字符应为小写。

例如:

My Lady D'Arbanville => True
My Lady d'arbanville => False
My LADY D'Arbanville => False

我试过了:^[A-Z][a-z ']*$但不工作

Answer 1

使用您显示的示例，请尝试以下正则表达式。

^[A-Z][a-z]+\s+[A-Z][a-z]+\s+[A-Z](?:'[A-Z])?[a-z]+$

Online demo for above regex

说明:为上述添加详细说明。

^[A-Z][a-z]+      ##Checking from starting of value if it starts from capital letter followed by 1 or more small letters here.
\s+               ##Matching 1 or more space occurrences here.
[A-Z][a-z]+       ##Matching 1 occurrence of capital letter followed by 1 or more small letters here.
\s+               ##Matching 1 or more space occurrences here.
[A-Z](?:'[A-Z])?  ##Matching single capital letter followed by optional ' capital letter here.
[a-z]+$           ##Matching 1 or more occurrences of small letters till end of value here.