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Regular Expressions

Pattern

What the pattern matches

^

Beginning of string

$

End of string

.

Any single character

[...]

Any character listed between the square brackets

[^...]

Any character not listed between the square brackets

p1|p2|p3

Alternation; matches any of the patterns p1, p2, or p3

*

Zero or more instances of preceding element

+

One or more instances of preceding element

{n}

n instances of preceding element

{m,n}

m through n instances of preceding element