Regular Expressions [Part 2] - Metacharacter Symbols

hello world does not match Hello
hello world matches Hello
hello world matches ^h
funk hello world does not match ^h
funk hello world matches d$
funk hello world matches world$
hello matches ^hello$
hello matches h.llo
heeeeeeeeee12365423llo matches h*llo
hllo matches h*llo
gray matches gre?a?y
grey matches gre?a?y
greay matches gre?a?y
griy does not match gre?a?y
Gray? matches gre?a?y\?

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