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