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Add feature #248

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11 changes: 11 additions & 0 deletions README.md
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Expand Up @@ -112,6 +112,8 @@ not match the string `the`.

[Test the regular expression](https://regex101.com/r/1paXsy/1)

**[⬆ back to top](#table-of-contents)**

## 2. Meta Characters

Meta characters are the building blocks of regular expressions. Meta
Expand Down Expand Up @@ -402,6 +404,8 @@ character and the matcher must be at the end of the string.

[Test the regular expression](https://regex101.com/r/t0AkOd/1)

**[⬆ back to top](#table-of-contents)**

## 3. Shorthand Character Sets

There are a number of convenient shorthands for commonly used character sets/
Expand All @@ -417,6 +421,8 @@ regular expressions:
|\s|Matches whitespace characters: `[\t\n\f\r\p{Z}]`|
|\S|Matches non-whitespace characters: `[^\s]`|

**[⬆ back to top](#table-of-contents)**

## 4. Lookarounds

Lookbehinds and lookaheads (also called lookarounds) are specific types of
Expand Down Expand Up @@ -496,6 +502,8 @@ string that are not after the word `The` or `the`.

[Test the regular expression](https://regex101.com/r/8Efx5G/1)

**[⬆ back to top](#table-of-contents)**

## 5. Flags

Flags are also called modifiers because they modify the output of a regular
Expand Down Expand Up @@ -575,6 +583,8 @@ at the end of each line in a string.

[Test the regular expression](https://regex101.com/r/E88WE2/1)

**[⬆ back to top](#table-of-contents)**

## 6. Greedy vs Lazy Matching
By default, a regex will perform a greedy match, which means the match will be as long as
possible. We can use `?` to match in a lazy way, which means the match should be as short as possible.
Expand All @@ -591,6 +601,7 @@ possible. We can use `?` to match in a lazy way, which means the match should be

[Test the regular expression](https://regex101.com/r/AyAdgJ/2)

**[⬆ back to top](#table-of-contents)**

## Contribution

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