Match One of Many Characters (匹配多个字符中的一个)

1. 需求及方法

1) Calendar with misspellings

c[ae]l[ae]nd[ae]r

2) Hexadecimal character

[a-fA-F0-9]

3) Non-hexadecimal character

[^a-fA-F0-9]

2. 小结

1). Shorthand character

d matches a single digit

D matches any character that is not a digit

w matches a single word character

W matches a character that is not part of such a propellerhead word

s matches any whitespace character (including spaces,tabs,line breaks)

S matches any character not matched by <s>

2). Case insensitivity

(?i)

eg. (?i)[A-F0-9]

（编辑：李大同）

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