December 2016
Beginner
48 pages
1h 12m
English
Content preview from Introducing Regular Expressions: JavaScript and TypeScript
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Appendix
As a quick reference, here you will find all the metacharacters and their descriptions.
Table A-1. Characters
Abbreviation | Description |
|---|---|
. | Any character |
[] | One out of an inventory of characters |
[ˆ] | One not in the inventory of characters |
. | The dot |
\ | Masking special chars |
\\ | The backslash |
Table A-2. Groups
Abbreviation | Description |
|---|---|
() | Counting group. |
(?:) | Non-counting groups. |
(?=) | Lookahead reference. Matches if the next character matches. |
(?=!) | Negative lookahead reference. Matches if the next character does not match. |
Table A-3. Operators
Operator | Meaning | Description |
|---|---|---|
? | 0 – 1 | Zero or one character(s) |
* | 0 – ∞ | Zero or any number of characters |
+ | 1 – ∞ | One or any number of characters |
{zahl} | number | Exact “number” of characters |
{min,} | min – ∞ | Minimum ... |
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