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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