ruby regular expression cheat template

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/ pattern start and end[ ] character set or range, such as [aeiou] or [a-z]| or, && and^ notcharacters:\w any wordlike character (alphanumeric or _ )\d any digit 0–9\s whitespace\w any non-wordlike character\d any character that is not a digit\s anything except whitespace. 0 or 1 times (optional){2} exactly two times{1,3} minimum of 1 time, maximum of 3 times. {3,} 3 or more times{,4} 4 or less timesanchors:\b match between spaces or a period\a start the match at the start of the string\z end the match at the end of the string^ start matching after a newline$ stop matching before a newline\g start at the point where last match finishedgrouping:( ) group characters together and capture (return) the groups(?

use on a string to match a regex, or on a regex (literal or in a variable) to match a string. can also be used on a string to match a regex or on a regex to match a string. returns a matchdata object or nil, which can be used as boolean true or false. the replacement string can include \0 to re-insert the regex match, or \1, \2, \3, etc for the capture groups.

regex accelerated course and cheat sheet. for easy navigation net, javascript, python, ruby: vertical tab. \v, perl boundaries. boundary characters are helpful in anchor ing your pattern to some edge, but do not se lect any characters pattern start and end [ ] character set or range, such as [aeiou] or [a-z] | or, && and ^ not characters: \w , regex, regex, regex cheat sheet pdf, regex examples, regex cheat sheet javascript.

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