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(libc.info)Pattern Matching

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Pattern Matching
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   The GNU C Library provides pattern matching facilities for two kinds
of patterns: regular expressions and file-name wildcards.  The library
also provides a facility for expanding variable and command references
and parsing text into words in the way the shell does.

Wildcard Matching

Matching a wildcard pattern against a single string.

Globbing

Finding the files that match a wildcard pattern.

Regular Expressions

Matching regular expressions against strings.

Word Expansion

Expanding shell variables, nested commands,

arithmetic, and wildcards. This is what the shell does with shell commands.