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Given a regular expression, is there a library or webservice which will give the human/non-programmer an English description?
For example, .+ => one or more characters
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$ means "Match the end of the string" (the position after the last character in the string).
[] denotes a character class. () denotes a capturing group. (a-z0-9) -- Explicit capture of a-z0-9 . No ranges.
Example 4: Solution: As we know, any number of a's means a* any number of b's means b*, any number of c's means c*. Since as given in problem statement, b's appear after a's and c's appear after b's. So the regular expression could be: R = a* b* c*
There are also two types of regular expressions: the "Basic" regular expression, and the "extended" regular expression. A few utilities like awk and egrep use the extended expression. Most use the "basic" regular expression. From now on, if I talk about a "regular expression," it describes a feature in both types.
There is an excellent site called http://regex101.com that does exactly that, as well. It also provides access to different regex engines, allows you to save and debug your regexes and test strings...very nice.
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