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how to use The "wildcard" character using regular-exp?

In regular expressions, a period can stand for any character. Normally, the newline character is not included, but most tools have optional switches to force inclusion of the newline character also. Using a period in a pattern is a way of requiring that "something" occurs here, without having to decide what.

Users who are familiar with DOS command-line wildcards will know the question-mark as filling the role of "some character" in command masks. But in regular expressions, the question-mark has a different meaning, and the period is used as a wildcard.

asked Sep 13, 2013 in Regular-exp by rajesh
edited Sep 12, 2013
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answered Sep 13, 2013 by rajesh
edited Sep 12, 2013