|
Regex operator |
Meaning |
|
. |
Matches any single character. |
|
? |
The preceding item is optional and will be matched, at most, once. |
|
* |
The preceding item will be matched zero or more times. |
|
+ |
The preceding item will be matched one or more times. |
|
{N} |
The preceding item is matched exactly N times. |
|
{N,} |
The preceding item is matched N or more times. |
|
{N,M} |
The preceding item is matched at least N times, but not more than M times. |
|
– |
Represents the range if it’s not first or last in a list or the ending point of a range in a list. |
|
^ |
Matches the empty string at the beginning of a line; also represents the characters not in the range of a list. |
|
$ |
Matches the empty string at the end of a line. |
|
\b |
Matches the empty string at the edge of a word. |
|
\B |
Matches the empty string provided it’s not at the edge of a word. |
|
\< |
Match the empty string at the beginning of word. |
|
\> |
Match the empty string at the end of word. |
|
(a|b) |
Match a or b |
|
[abc] |
Range (a or b or c) |
|
[^abc] |
NOT a or b or c |
|
[a-z] |
Any letter (lowercase) from a to z |
|
[A-Z] |
Any letter (uppercase) from a to z |
|
[a-zA-Z] |
Any letter (upper and lowercase) from a to z |
|
[0-9] |
Any digit from 0 to 9 |
A most exhaustive cheat sheet is available here