User Guide : Using Content Extraction Language : Language Syntax and Examples : .
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The dot ( . ) is a metacharacter that is used in regular expressions. It matches any single character except newline.
will match any since character followed by bc. Like abc, bbc, cbc, 9bc, zbc, 7bc.
will match any three consecutive characters
will match any string containing exactly one character. For information on how they participated in this regular expression, see ^ and $.