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Description overview:- expression | returns "Fats Waller" =~ /a/ | 1 /a/ =~ "Fats Waller"| 1 'very interesting' =~ /t/ in this :- $& receives the part of the string | "t" $` receives that preceded the match | "very interes" $' receives that after the match |"eresting" match also sets the thread-global variables $~ and $1 through $9 example:- def show_regexp(a, re) ----if a =~ re ------"#{$`}<<#{$&}>>#{$'}" ----else ------"no match" ----end end expression | returns show_regexp('very interesting', /t/) | very in<<t>>eresting exception :- characters except| ., pipe sym, (, ), [, ], {, }, +, \, ^, $, *, and ? expression | returns show_regexp('yes [ no', /\[/) | yes <<[>> no show_regexp('yes (no)', /\(no\)/) | yes <<(no)>> show_regexp('are you sure?', /e\?/) | are you sur<<e?>> Anchors:- expression | returns /^option/ matches only if it appears at the Start of a line show_regexp("this is the mail \n the time", /^the/) | this the is \n <<the>> time /option$/ matches only if it appears at the End of a line show_regexp("this is a is \n this is time", /is$/) | this is a <<is>>\n this is time \A matches the beginning of a string show_regexp("this is\nthe time", /\Athis/) | <<this>> is\nthe time \Z match the end of a string show_regexp("this time is\nthe time\n", /time\Z/) | this time is\nthe <<time>>\n \b match word boundaries show_regexp("this is\nthe time", /\bis/) | this <<is>>\nthe time \B match nonword boundaries show_regexp("this is\nthe time", /\Bis/) | th<<is>> is\nthe time Character Classes:- [characters] [aeiou] | will match a vowel [\b] | backspace character [\n] | a newline [\s] | whitespace character .,pipe,(,),[,{,+,^,$,*,? —is turned off inside the brackets Example Character Classes:- expression | returns show_regexp('Proce $12.', /[aeiou]/) | Pr<<o>>ce $12. show_regexp('Price $12.', /[\s]/) | Price<< >>$12. show_regexp('Price $12.', /[[:digit:]]/) | Price $<<1>>2. show_regexp('Price $12.', /[[:space:]]/) | Price<< >>$12. show_regexp('Price $12.', /[[:punct:]aeiou]/) | Pr<<i>>ce $12. [^a-z] matches any character that isn’t a lowercase alphabetic a = see [Design Patterns-page 123] show_regexp(a, /[^a-z]/) | see<< >>[Design Patterns-page 123] show_regexp(a, /[^a-z\s]/)| see <<[>>Design Patterns-page 123] Check this:- a = 'It costs $12.' show_regexp(a, /c.s/) | It <<cos>>ts $12. show_regexp(a, /./) | <<I>>t costs $12. show_regexp(a, /\./) | It costs $12<<.>> Character class abbreviations:- Sequence |As [ . . . ] |Meaning \d |[0-9] |Digit character \D |[^0-9] |Any character except a digit \s |[\s\t\r\n\f] |Whitespace character \S |[^\s\t\r\n\f]|Any character except whitespace \w |[A-Za-z0-9_] |Word character \W |[^A-Za-z0-9_]|Any character except a word character POSIX Character Classes:- Sequence |Meaning [:alnum:]| Alphanumeric [:alpha:]| Uppercase or lowercase letter [:blank:]| Blank and tab [:cntrl:]| Control characters (at least 0x00–0x1f, 0x7f) [:digit:]| Digit [:graph:]| Printable character excluding space [:lower:]| Lowercase letter [:print:]| Any printable character (including space) [:punct:]| Printable character excluding space and alphanumeric [:space:]| Whitespace (same as \s) [:upper:]| Uppercase letter [:xdigit:]| Hex digit (0–9, a–f, A–F) Repetition:-
Please answer the following question Bread, ham or milk: which is something to drink?
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