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Introduction
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PHP Manual

# Regular Expression Functions (POSIX Extended)

- Introduction
- Installing/Configuring
  - Installation
  - Runtime Configuration
  - Resource Types
- Predefined Constants
- Examples
- Regex Functions
  - ereg_replace — Replace regular expression
  - ereg — Regular expression match
  - eregi_replace — Replace regular expression case insensitive
  - eregi — Case insensitive regular expression match
  - split — Split string into array by regular expression
  - spliti — Split string into array by regular expression case insensitive
  - sql_regcase — Make regular expression for case insensitive match

wordwrap
Introduction
Text Processing
PHP Manual