正则表达式中
单词指的是由字母、数字、下划线组合而成的字符串，用符号表示为\w（小写）。
空白符包括单字节空格、双字节空格、制表符，用符号表示为\s（小写）。
1.匹配被双引号包含的所有字符串（strings surrounded by double-quotation marks）
".*?"
2.匹配被方括号包含的所有字符串（strings surrounded by [ ]）
\[[^\[]*?\]
3.匹配变量名(variable names)
[a-zA-Z_][a-zA-Z_0-9]*
4.删除所有空白行
^\s*\n
strings surrounded by double-quotation marks
".*?"
strings surrounded by [ ]
\[[^\[]*?\]
variable names
[a-zA-Z_][a-zA-Z_0-9]*
IP addresses
([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})
URL
(\S+)://([^:/]+)(:(\d+))?(/[^#\s]*)(#(\S+))?
lines followed by a tab
\t.*$
Hiragana
[\x{3041}-\x{309e}]
Full-width Katakana
[\x{309b}-\x{309c}\x{30a1}-\x{30fe}]
Half-width Kana
[\x{ff61}-\x{ff9f}]
CJK ideographs
[\x{3400}-\x{9fff}\x{f900}-\x{fa2d}]
CJK ideograph marks
[\x{3000}-\x{3037}]
Hangul
[\x{1100}-\x{11f9}\x{3131}-\x{318e}\x{ac00}-\x{d7a3}]
Insert // at start of lines
Find: ^
Replace with: //
Remove // at start of lines
Find: ^//
Replace:
Remove trailing whitespaces
Find: \s+?$
Replace with:
Replace (abc) with [abc]
Find: \((.*?)\)
Replace: \[\1\]
Replace <H3 ...> with <H4 ...>
Find: <H3(.*?)>
Replace: <H4\1>
Replace 9/13/2003 with 2003.9.13
Find: ([0-9]{1,2})/([0-9]{1,2})/([0-9]{2,4})
Replace: \3\.\1\.\2
Uppercase characters from a to z
Find: [a-z]
Replace: \U\0
Capitalize all words
Find: ([a-zA-Z])([a-zA-Z]*)
Replace: \U\1\L\2