Regexps use elements to instruct the regular expression engine on how to find a given string.


A combination of the special characters, enclosed by a pair of slashes (//), makes up a regular expression pattern. 


^        Matches the beginning of a line

$        Matches the end of a line

\w       Matches a word character

[...]    Matches any character in the brackets

[^...]   Matches any characters not in the brackets

*        Matches zero or more occurrences of the previous regexp

+        Matches one or more occurrences of the previous regexp

?        Matches zero or one occurrences of the previous regexp

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4.	grep(/men/)
5.	grep(/m[ae]n/)
6.	grep(/men\|man/)
7.	grep(/m(e\|a)n/)
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12.	grep(/[$\d\d\d$]?\d\d\d-\d\d\d\d/)
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14.	grep(/[$\d+$]?\d+-\d+/)
15.	grep(/[$\d{3}$]?\d{3}-\d{4}/)
16.	Implementing Class and Singleton Methods
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19.	Match Perl, a space, and Python
20.	Match Perl, zero or more spaces, and Python
21.	Match Perl, one or more spaces, and Python
22.	Match Perl, whitespace characters, then Python
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Regexps use elements to instruct the regular expression engine on how to find a given string. : Regexps « Development « Ruby

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