trex

Description and usage

trex is a tiny regex library with UTF-8 support.

Usage is simple:

if (regexmatch("^\\\\fcharset\\d+ ?$", rtfcommand)) { 
    /* set the character set for the current font definition */ 
}

Features

• Public domain
• UTF-8 aware and locale aware
• Small source code size (< 100 SLOC)
• Small binary size (~3.5kb on macOS, ~4kb on Linux)
• No dynamic memory allocation
• Supports standard metacharacter classes \d, \s, and \w
• Easy to add additional metacharacter classes (e.g., supports \x for hexadecimal digits out of the box)

Limitations

• No character sets, e.g., [0-9]
• No character groups or alternates, e.g., (abc|def)
• No quantifiers, e.g., \d{1,5}
• No support for index or match length (return value only indicates whether there's a match)
• Locale support relies on system library iswxxxxx functions