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---
regexp: |-
A regexp's form is written /pattern/modifiers where "pattern" is the regular expression itself, and "modifiers" are a series of characters indicating various options.
(see an alternate/more complete cheat-sheet with 'cheat regex')
/i makes match case insensitive.
/m makes the dot match newlines.
/o causes any #{...} substitutions in a particular regex literal to be performed just once, the first time it is evaluated. Otherwise, the substitutions will be performed every time the literal generates a Regexp object.
[] range specification (e.g., [a-z] means a letter in the range a to z)
\w letter or digit; same as [0-9A-Za-z]
\W neither letter or digit
\s space character; same as [ \t\n\r\f]
\S non-space character
\d digit character; same as [0-9]
\D non-digit character
\b backspace (0x08) (only if in a range specification)
\b word boundary (if not in a range specification)
\B non-word boundary
* zero or more repetitions of the preceding
+ one or more repetitions of the preceding
{m,n} at least m and at most n repetitions of the preceding
? at most one repetition of the preceding; same as {0,1}
| either preceding or next expression may match
() grouping
print "success" if subject =~ /regex/
result = subject.gsub(/before/, "after")
myarray = mystring.scan(/delimiter/)