1. strglob is a C development library designed to enumerate characters/numbers/strings by expanding "globbing" pattern syntax.
2. Its purpose is to provide a compact specification for test case input string generation.
3. strglob supports a wide variety of syntax types for both character and string generation including:

• Number Ranges
  • Zero Padded Ranges
  • Negative Integer Ranges

• Letter Ranges

• Reverse Ranges

• Character Classes

• String Classes

• String Sets

• Environment Expansion

• File Includes

Numeric and character ranges are denoted by square brackets

• [0-9] (numeric range)
• [a-z] (character range)

Strings are signified with curly braces

• {abc} (string literal)

Range limits are delimited by dashes which are also for signing negative integers

• [-1--3] (range from negative to negative)
• [-1-3] (range from negative to positive)
• [1--3] (range from positive to negative)
• [1-3] (range from positive to positive)

String sets are separated by commas

• {foo,bar,baz} (set of string literals)

Both character and string class names are surrounded by colons

• {:Wdays:} (string class)
• [:alnum:] (character class)

Most character class identifiers are taken from the standard C library's ctype.h header file

• [:punct:] (from ctype.h)
• [:number:] (NOT from ctype.h)

Bash-style sequence expressions are specified with curly braces and take an optional numeric increment value

• {0..4..1} (Bourne Again style brace expansion sequence expression, refer to bash(1))