This is a draft cheat sheet. It is a work in progress and is not finished yet.
Characters
. |
Any Character (Except New Line) |
\d |
Digit (0-9) |
\D |
Not a Digit (0-9) |
\w |
Word Character (a-z, A-Z, 0-9) |
\W |
Not a Word Character |
\s |
Whitespace (space, tab, newline) |
\S |
Not Whitespace |
Anchors and Boundaries
\b |
Word Boundary |
\B |
Not a Word Boundary |
^ |
Beginning of a String |
$ |
End of a String |
Character Classes
[] |
Matches Characters in brackets |
[^] |
Matches Characters not in brackets |
| |
Either or |
( ) |
Group |
Quantifiers
? |
0 or 1 |
* |
0 or More |
+ |
1 or More |
{3} |
Exact Number |
{3,4} |
Range of Numbers {Min, Max} |
{3,} |
Min or More |
|
|
Special Characters
Those characters need to be escaped.
Logic
| |
OR |
( ...|... ) |
Capturing group |
\1 |
Contents of Group 1 |
\2 |
Contents of Group 2 |
|
