- Copyright
- About The Author
- Acknowledgments
- Introduction
- Files and Directories
- Compiler Notes and Options
- UNIX File System Objects
- Error Handling and Reporting
- UNIX Input and Output
- File Locking
- Managing Files and Their Properties
- Directory Management
- Obtaining the Working Directory
- Changing the Current Directory
- Making a New Directory
- Removing a Directory
- Opening a Directory for Searching
- Closing a Directory
- Searching a Directory
- Rewinding to the Start of a Directory
- Saving Position Within a Directory
- Restoring Position Within a Directory
- Scanning a Directory
- Walking a Directory Structure
- Changing Your Root Directory
- Summary
- Temporary Files and Process Cleanup
- Library Functions
- UNIX Command-Line Processing
- Conversion Functions
- UNIX Date and Time Facilities
- User ID, Password, and Group Management
- Introduction to UNIX User Management
- The getuid(2) and geteuid(2) Functions
- The getgid(2) and getegid(2) Functions
- Real, Effective, and Saved User ID
- Setting User ID
- Setting Group ID
- The FreeBSD Function issetugid(2)
- The /etc/passwd File
- The Password Database Routines
- The Group Database
- Related Re-entrant Functions
- Supplementary Groups
- Summary
- Static and Shared Libraries
- Database Library Routines
- Advanced Concepts
- Index
Chapter 21. Regular Expressions
The patterns supported by the fnmatch(3) and glob(3) functions are useful for filename matches because they are simple and easily understood. Text searches, however, often require something more powerful. This chapter examines regular expressions and the support that exists for them.
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