Quick regex reference
- a
- contains a "a" letter
- [abc]
- a single character of "a", "b" or "c"
- [^abc]
- any single character except "a", "b" or "c"
- [a-z]
- any single character in "a" to "z"
- [a-zA-Z]
- any single character in "a" to "z" or "A" to "Z"
- .
- any single character
- a*
- zero "a" or more
- a+
- one "a" or more
- a?
- zero or one "a"
- a{2}
- exactly 2 "a"
- a{4,8}
- between 4 and 8 "a"
- a{10,}
- 10 or more "a"
- [[:alnum:]]
- a letter (up/low case) or number
- [[:alpha:]]
- a letter (up/low case)
- [[:blank:]]
- a space or tab character
- [[:cntrl:]]
- a control character
- [[:digit:]]
- a digit character
- [[:lower:]]
- a lower letter (works with "upper")
- [[:space:]]
- a spacing character (\t|\n...)
- [[:xdigit:]]
- a hexadecimal digit
- [[:punct:]]
- a puntuation character
- .
- any single character
- a*
- zero "a" or more
- a+
- one "a" or more
- a?
- zero or one "a"