REGEX basic every-programmer should know.
Regular Expressions
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Description
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hello
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The string “hello”
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^hello
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“hello” at the start of a string
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hello$
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“hello” at the end of a string
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^hello$
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“hello” when it is alone on a string
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[abc]
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a, b, or c
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[a-z]
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Any lowercase letter
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[^A-Z]
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Any character that is not
a uppercase letter
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(gif|jpg)
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Matches either “gif” or “jpeg”
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[a-z]+
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One or more lowercase letters
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[0-9.-]
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Any
number, dot, or minus sign
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^[a-zA-Z0-9_]{1,}$
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Any word of at least one letter, number
or _
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([wx])([yz])
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wy, wz, xy, or xz
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[^A-Za-z0-9]
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Any symbol (not a number or a letter)
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([A-Z]{3}|[0-9]{4})
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Matches three letters or four numbers
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