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Make section 4 titles singular

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Tom McAndrew 2020-03-10 17:17:18 +00:00 committed by GitHub
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@ -77,10 +77,10 @@ letter and also it is too short.
- [The Dollar Sign](#282-the-dollar-sign)
- [Shorthand Character Sets](#3-shorthand-character-sets)
- [Lookarounds](#4-lookarounds)
- [Positive Lookaheads](#41-positive-lookaheads)
- [Negative Lookaheads](#42-negative-lookaheads)
- [Positive Lookbehinds](#43-positive-lookbehinds)
- [Negative Lookbehinds](#44-negative-lookbehinds)
- [Positive Lookahead](#41-positive-lookahead)
- [Negative Lookahead](#42-negative-lookahead)
- [Positive Lookbehind](#43-positive-lookbehind)
- [Negative Lookbehind](#44-negative-lookbehind)
- [Flags](#5-flags)
- [Case Insensitive](#51-case-insensitive)
- [Global Search](#52-global-search)
@ -435,7 +435,7 @@ expressions:
|?<=|Positive Lookbehind|
|?<!|Negative Lookbehind|
### 4.1 Positive Lookaheads
### 4.1 Positive Lookahead
The positive lookahead asserts that the first part of the expression must be
followed by the lookahead expression. The returned match only contains the text
@ -454,7 +454,7 @@ or `the` only if it's followed by the word `fat`.
[Test the regular expression](https://regex101.com/r/IDDARt/1)
### 4.2 Negative Lookaheads
### 4.2 Negative Lookahead
Negative lookaheads are used when we need to get all matches from an input string
that are not followed by a certain pattern. A negative lookahead is written the same way as a
@ -469,7 +469,7 @@ from the input string that are not followed by a space character and the word `f
[Test the regular expression](https://regex101.com/r/V32Npg/1)
### 4.3 Positive Lookbehinds
### 4.3 Positive Lookbehind
Positive lookbehinds are used to get all the matches that are preceded by a
specific pattern. Positive lookbehinds are written `(?<=...)`. For example, the
@ -482,7 +482,7 @@ from the input string that come after the word `The` or `the`.
[Test the regular expression](https://regex101.com/r/avH165/1)
### 4.4 Negative Lookbehinds
### 4.4 Negative Lookbehind
Negative lookbehinds are used to get all the matches that are not preceded by a
specific pattern. Negative lookbehinds are written `(?<!...)`. For example, the