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Q. What are examples of regular expressions?
•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
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