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Quantifiers: May occur once, numerous times, or none
/trees/ - Searches for tree, trees, or treess ...
Greedy: Find the first match that occurs
? - "this and thus" /th.?s/ matches "this" /th.*s/ would match "this and thus" (to the last 's')
Modifiers: Ignore newline characters and the search string is treated as a single line
s - For example '.' will now match any character, even newline characters.
Transliteration: Replace each character
=~ tr/abc/xyz/; Replaces all 'a' with 'x', all 'b' with 'y', etc.
Transliteration: Delete extra characters
=~ tr/ABC/ab/d; - Replace 'A' with 'a', 'B' with 'b', deletes 'C' (Without d, 'C' with 'b')