| SYMBOL |
DESCRIPTION |
/regex/ |
A regex is normally enclosed between two forward slashes. |
/regex/i |
A case insensitive search. |
/regex/g |
A global search. |
. |
Represents any single character. |
? |
The preceding character may or may not be present. |
+ |
One or more copies of the preceding character. |
* |
Zero or more copies of the preceding character. |
{} |
An integer n enclosed in curly brackets means we want n copies of the preceding character. |
| |
The boolean or operator. |
() |
The inside of these brackets is evaluated as a group. |
[] |
Alternative boolean or operator for each element in the brackets. |
[-] |
Represents a range of characters or integers. |
[^-] |
Represents all characters not in a range. |
\ |
Escape character, allows special characters to be read without their special meaning when placed immediately in front of them. Common characters required to be escaped are: ., ?, +, *, {, }, |, (, ), [, ], -, ^, \ and $. |