C # Regular Expression escape character introduction _c# tutorial

A regular expression (regular expression) describes a pattern of string matching that can be used to check whether a string contains a seed string, replaces a matching substring, or extracts a substring from a string that matches a condition.

Escape matching syntax:

"\" + actual character \. * + ? | () {}^ $ [] For example: \ match character "\"

\ n Match Line Wrap

\ r Match Carriage return

\ t matches horizontal tab

\v Matching Vertical tabs

\f Match page Change

\NNN matches a 8-in-system ASCII

\XNN matches a 16-in-system ASCII

\UNNNN matches 4 16-in Uniode

\c+ uppercase Match Ctrl-capital example: \cs-matching Ctrl+s

Note:

Enter double quotes in a string of type @ "" to write two double quotes, such as:

If you want to say: James "Wu"

To write: @ "James" "Wu" ""

PS: the backslash (\) in the regular expression indicates one of the following values:

The followed character is a special character, as shown in the following section table. For example, \b is an anchor point that indicates that a regular expression matches the start of a word boundary, \ t represents a tab, and \x020 represents space.

Characters that should be interpreted as not escaping language constructs should be interpreted literally. For example, a brace ({) begins to define a qualifier, and a backslash followed by a brace (\{) indicates that the regular expression engine should match the braces. Similarly, a single backslash marks the start of the escaped language construct, and two backslashes (\ \) indicate that the regular expression engine should match the backslash.