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This article mainly talks about "grammatical summary of VBS regular expressions". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn the grammar summary of VBS regular expressions.

Regular expression syntax

A regular expression is a text pattern consisting of ordinary characters (such as characters a to z) and special characters (called metacharacters). The pattern describes one or more strings to be matched when finding the body of the text. The regular expression acts as a template that matches a character pattern with the searched string.

Here are some examples of regular expressions that you might encounter:

Visual Basic Scripting EditionVBScript match / ^\ [\ t] * $/ "^\ [\ t] * $" matches a blank line. /\ d {2} -\ d {5} / "\ d {2} -\ d {5}" verify that an ID number consists of a 2-digit number, a hyphen, and a 5-digit number. /. * / ". *" matches a HTML tag.

The following table is a complete list of metacharacters and their behavior in the context of regular expressions:

Character description\ marks the next character as a special character, or a literal character, or a backward reference, or an octal escape character. For example,'n 'matches the character "n".' \ n' matches a newline character. The sequence'\ 'matches "\" and "(" matches "(". ^ matches the starting position of the input string. If the Multiline property of the RegExp object is set, ^ also matches the position after'\ n'or'\ r'. $matches the end of the input string. If the Multiline property of the RegExp object is set, $also matches the position before'\ n'or'\ r'. * matches the previous subexpression zero or more times. For example, zo* can match "z" and "zoo". * is equivalent to {0,}. + matches the previous subexpression one or more times. For example, 'zo+' can match "zo" and "zoo", but not "z". + is equivalent to {1,}. ? Matches the previous subexpression zero or once. For example, "do (es)?" Can match "do" in "do" or "does". ? It is equivalent to {0jue 1}. {n} n is a non-negative integer. Match the determined n times. For example,'o {2} 'does not match the' o'in 'Bob', but does match the two o in 'food'. {n,} n is a non-negative integer. Match at least n times. For example,'o {2,} 'does not match' o'in 'Bob', but does match all o in 'foooood'. O {1,}'is equivalent to 'oasis'. O {0,}'is equivalent to 'oval'. {n ·m} m} m and n are non-negative integers, where n

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