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December 8, 2003 - Pattern Matching - Substrings - Part II

Last week, pattern matching was used to parse a variable starting at the beginning (left side) of the variable.  One pound sign (#) was used to delete the smallest matching pattern, and two were used to delete the largest.

If you want to parse a variable starting at the end (right side) of the variable, one or two percent signs (%) are used.  Using the same variable from last week, let's parse the smallest matching pattern:

$ TEXT="livefire_labs_provides_online_unix_training_with_hands_on_lab_exercises"
$ print ${TEXT%_*}

Notice that everything to the right of the last underscore (the smallest matching pattern) was removed from the variable.  Adding a second percent sign will delete the largest matching pattern:

$ print ${TEXT%%_*}

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