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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.
10.1 Wildcard Matching Matching a wildcard pattern against a single string. 10.2 Globbing Finding the files that match a wildcard pattern. 10.3 Regular Expression Matching Matching regular expressions against strings. 10.4 Shell-Style Word Expansion Expanding shell variables, nested commands, arithmetic, and wildcards. This is what the shell does with shell commands.
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