Regular Expression Syntax¶
There are two types of regular expressions: regex (OS_Regex) and sregex (OS_Match).
Regex (OS_Regex) syntax¶
This is a fast and simple library for regular expressions in C.
This library is designed to be simple while still supporting the most common regular expressions.
Supported expressions
| Expressions | Valid characters |
|---|---|
| \w | A-Z, a-z, 0-9, ‘-‘, ‘@’ characters |
| \d | 0-9 character |
| \s | Spaces ” “ |
| \t | Tabs |
| \p | ()*+,-.:;<=>?[]!”’#$%&|{} |
| \W | Anything not w |
| \D | Anything not d |
| \S | Anything not s |
| \. | Anything |
Modifiers
| Expressions | Actions |
|---|---|
| + | To match one or more times |
| * | To match zero or more times |
Special characters
| Expressions | Actions |
|---|---|
| ^ | To specify the beginning of the text |
| $ | To specify the end of the text |
| | | To create a logical or between multiple patterns |
Characters escaping
To utilize the following characters they must be escaped with: \
| $ | ( | ) | \ | | |
|---|---|---|---|---|
| \$ | \( | \) | \ \ | \| |
Sregex (OS_Match) syntax¶
This is faster than OS_Regex, but only supports simple string matching and the following special characters.
Special characters
| Expressions | Actions |
|---|---|
| ^ | To specify the beginning of the text |
| $ | To specify the end of the text |
| | | To create a logic: or, between multiple patterns |
| ! | To negate the expression |