Regular expressions in short

Roshan Karki Anonymous
Caret (^)Matches the expression at the start of a line, as in ^A
Question mark (?)Matches the expression at the end of a line, as in A?
Backslash (\)Turns off the special meaning of the next character, as in \^
Brackets ([])Matches any one of the enclosed characters, as in [aeiou] (Use a hyphen [-] for a range, as in [0-9].)
[^ ] Matches any one character except those enclosed in brackets, as in [^0-9]
Period (.)Matches a single character of any value except end of line
Asterisk (*)Matches zero or more of the preceding characters or expressions
\{x,y\} Matches x to y occurrences of the preceding
\{x\} Matches exactly x occurrences of the preceding
\{x,\} Matches x or more occurrences of the preceding


Source: ibm.com

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