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Pig >> mail # user >> how to use builtin String functions

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how to use builtin String functions
I see there are some builtin string functions, but I don't know how to use
them. I got this error when I follow the examples:

grunt> REGEX_EXTRACT_ALL('', '(.*)\:(.*)');
2011-01-12 19:34:23,773 [main] ERROR org.apache.pig.tools.grunt.Grunt -
ERROR 1000: Error during parsing. Encountered " <IDENTIFIER>
"REGEX_EXTRACT_ALL "" at line 1, column 1.