Lessons: 26Length: 1.7 hours
- Overview
- Transcript
4.2 Lookaheads
In this lesson we'll use lookahead to isolate the URL of an email address. We'll also do a quick recap of lookbehinds and how these can also be used to help us when isolating elements of an email address. It's really quite easy to take advantage of lookaheads and lookbehinds. These will give you more options to make sure you're only matching what you need to.
1.Course Entrance
1.1Course Entrance00:27
1.1
Course Entrance
00:27
2.Chapter 1
2.1Your First Matches07:34
2.1
Your First Matches
07:34
2.2Character Classes and Alternation08:42
2.2
Character Classes and Alternation
08:42
2.3Carets and Dollars05:32
2.3
Carets and Dollars
05:32
2.4Capturing Values02:44
2.4
Capturing Values
02:44
2.5Greedy Matches02:01
2.5
Greedy Matches
02:01
2.6Ranges and Curly Braces04:21
2.6
Ranges and Curly Braces
04:21
3.Chapter 2
3.1Search and Replace03:45
3.1
Search and Replace
03:45
3.2Porting the Previous Exercise to PHP03:46
3.2
Porting the Previous Exercise to PHP
03:46
3.3preg_match and preg_match_all05:41
3.3
preg_match and preg_match_all
05:41
3.4The preg_split Function03:42
3.4
The preg_split Function
03:42
4.Chapter 3
4.1Negative Lookbehinds05:29
4.1
Negative Lookbehinds
05:29
4.2Lookaheads06:13
4.2
Lookaheads
06:13
4.3Non-capturing Groups01:57
4.3
Non-capturing Groups
01:57
4.4Backreferences03:03
4.4
Backreferences
03:03
5.Chapter 4
5.1Stripping Out an Anchor Tag's Attributes02:35
5.1
Stripping Out an Anchor Tag's Attributes
02:35
5.2Matching a US Phone Number, and Named Captures03:46
5.2
Matching a US Phone Number, and Named Captures
03:46
5.3Removing Whitespace03:01
5.3
Removing Whitespace
03:01
5.4Matching an Email Address03:31
5.4
Matching an Email Address
03:31
5.5Verifying a String's Length01:52
5.5
Verifying a String's Length
01:52
5.6The Beginnings of a Markdown-like Service04:44
5.6
The Beginnings of a Markdown-like Service
04:44
6.Chapter 5
6.1An Advanced Phone Number Expression03:15
6.1
An Advanced Phone Number Expression
03:15
6.2Add Comments with the X Flag04:51
6.2
Add Comments with the X Flag
04:51
6.3Conditional Expressions (if-then)02:55
6.3
Conditional Expressions (if-then)
02:55
6.4Callback Functions for a RegEx07:12
6.4
Callback Functions for a RegEx
07:12
7.Course Exit
7.1Course Exit00:38
7.1
Course Exit
00:38
