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.
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Matches any single character.
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0.0 matches 0x0 and 020 t..t matches strings such as test, text, and tart
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\
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Matches the character following the backslash. Also matches (escapes) special characters.
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172\.1\.. matches 172.1.10.10 but not 172.12.0.0 \. allows a period to be matched
as a period
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[ ]
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Matches the characters or a range of characters separated by a hyphen, within left
and right square brackets.
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[02468a-z] matches 0, 4, and w, but not 1, 9, or K
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^
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Matches the character or null string at the beginning of an input string.
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^123 matches 1234, but not 01234
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?
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Matches zero or one occurrence of the pattern. (Precede the question mark with Ctrl-V
sequence to prevent it from being interpreted as a help command.)
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ba?b matches bb and bab
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$
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Matches the character or null string at the end of an input string.
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123$ matches 0123, but not 1234
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*
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Matches zero or more sequences of the character preceding the asterisk. Also acts
as a wildcard for matching any number of characters.
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5* matches any occurrence of the number 5 including none 18\..* matches the characters
18. and any characters that follow 18.
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+
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Matches one or more sequences of the character preceding the plus sign.
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8+ requires there to be at least one number 8 in the string to be matched
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() []
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Nest characters for matching. Separate endpoints of a range with a dash (-).
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(17)* matches any number of the two-character string 17 ([A-Za-z][0-9])+ matches
one or more instances of letter-digit pairs: b8 and W4, as examples
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Concatenates constructs. Matches one of the characters or character patterns on either
side of the vertical bar.
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A(B|C)D matches ABD and ACD, but not AD, ABCD, ABBD, or ACCD
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_
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Replaces a long regular expression list by matching a comma (,), left brace ({),
right brace (}), the beginning of the input string, the end of the input string, or
a space.
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The characters _1300_ can match any of the following strings: ^1300$ ^1300space space1300
{1300, ,1300, {1300} ,1300,
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