Programming | network | syntax rules and tags for regular regular expressions
Now we formally enter the expression of learning, I will be based on the example of a combination of regular expression of the use, after reading you will feel that writing UBB code so simple, as long as you follow me step-by-Step after reading this article you become a UBB master. The exciting thing is that you can write your own UBB tags and no longer have to go to other people to copy ready-made code and templates. Fortunately VBScritp5.0 gave us a "regular expression" object, as long as your server installed ie5.x, you can run.
Character Description:
^ symbol matches the beginning of a string. For example:
^ABC matches "ABC XYZ" and does not match "XYZ ABC"
The $ symbol matches the end of the string. For example:
abc$ matches "xyz ABC" and does not match "ABC XYZ".
Note: If you use both the ^ symbol and the $ symbol, an exact match will be made. For example:
^abc$ only matches "ABC"
The * symbol matches 0 or more preceding characters. For example:
ab* can match "AB", "ABB", "abbb", etc.
The + symbol matches at least one of the preceding characters. For example:
Ab+ can match "ABB", "ABBB" and so on, but does not match "AB".
The symbol matches 0 or 1 preceding characters. For example:
Ab?c? Can and only match "abc", "Abbc", "ABCC" and "ABBCC"
. A symbol matches any character other than a newline character. For example:
(.) + matches all strings except line breaks
X|y matches "x" or "Y". For example:
ABC|XYZ can match "abc" or "XYZ", while "AB (c|x) yz" matches "Abcyz" and "abxyz"
{n} matches the preceding character of exactly n times (n is a non-negative integer). For example:
A{2} can match "AA", but does not match "a"
{N,} matches the preceding character at least n times (n is a non-negative integer). For example:
A{3,} matches "AAA", "AAAA" and so on, but does not match "a" and "AA".
Note: A{1,} is equivalent to A +
A{0,} equivalent to A *
{M,n} matches at least m, at most n preceding characters. For example:
a{1,3} only matches "a", "AA" and "AAA".
Note: a{0,1} is equivalent to a?
[XYZ] Represents a character set that matches one of the characters in parentheses. For example:
[ABC] matches "a", "B", and "C"
[^XYZ] Represents a negative character set. Matches any character that is not in this bracket. For example:
[^ABC] can match any character except "A", "B" and "C"
[A-z] represents a range of characters that matches any character within a specified interval. For example:
[A-z] matches any lowercase letter character between "a" and "Z"
[^m-n] represents a character outside a range that matches characters that are not in the specified range. For example:
[M-n] matches any character except from "M" To "N"
\ symbol is an escape operator. For example:
\ n Line Feed
\f Page Break
\ r Carriage Return
\ t tab
\v Vertical Tab
\ \ Match "\"
\/Match "/"
\s any white characters, including spaces, tabs, page breaks, and so on. Equivalent to "[\f\n\r\t\v]"
\s any characters that are not blank. Equivalent to "^\f\n\r\t\v]"
\w any word characters, including letters and underscores. Equivalent to "[a-za-z0-9_]"
\w any non word characters. Equivalent to "[^a-za-z0-9_]"
\b Matches the end of a word. For example:
ve\b match the word "love" and so on, but do not match "very", "even" and so on
\b Matches the beginning of a word. For example:
ve\b matches the word "very" and so on, but does not match "love" and so on
\d matches a numeric character, equivalent to [0-9]. For example:
ABC\DXYZ matching "abc2xyz", "abc4xyz" and so on,
But does not match "abcaxyz", "abc-xyz" and so on
\d matches a non-numeric character, equivalent to [^0-9]. For example:
ABC\DXYZ matching "abcaxyz", "abc-xyz" and so on,
But does not match "abc2xyz", "abc4xyz" and so on
\num matches num (where num is a positive integer), and the reference returns to the remembered match. For example:
(.) \1 matches two consecutive identical characters.
\onum matches N (where n is a octal value less than 256). For example:
\o011 Matching tab
\xnum matches num (where num is a hexadecimal swap value less than 256). For example:
\x41 matching character "A"
