Chapter 4: Advanced Patterns

  1. 4.1 - Positive Lookahead
  2. 4.2 - Negative Lookahead
  3. 4.3 - Atomic Groups

4.1 - Positive Lookahead

Use \d+ for positive lookahead.

  1. 1.1 - Simple Match
  2. 1.2 - Grouping

4.2 - Negative Lookahead

Use \d+ for negative lookahead.

  1. 2.1 - Simple Match
  2. 2.2 - Grouping

4.3 - Atomic Groups

Use (?:) for atomic groups.

  1. 3.1 - Simple Match
  2. 3.2 - Grouping