Parenthesis Matching in Emacs - Daniel Han's Technical …
How can I highlight the matching parentheses, while browsing the file in vi?
14/03/1998 · Parenthesis Matching in Emacs
The C shell has a special mechanism for specifying arrays, using parenthesis:Therefore the following two statements are equivalent:The parenthesis is preferred for several reasons.
I do have the parenthesis library working which highlights the
matching parenthesis but if the matching parenthesis is out
of the page how do I get to it without moving the cursor ??
Why, oh WHY, do those #?@! nutheads use vi?
It is possible to suppress the capture of any subexpression or group (enclosed in parenthesis) into a backreference by adding the string '?:' immediately after the opening parenthesis (. The following example illustrates this behaviour:
All regular expression implementations that claim BRE (or higher) compatibility provide the last results of each separate match enclosed in parenthesis (officially called a subexpression but frequently called a submatch or group) in variables that may subsequently (after the regular expression has been executed) be used or substituted in an expression by using a backreference. There may be one or more such groupings in any regular expression. These variables are usually numbered $1 to $9. Where $1 will contain the first submatch, $2 will contain the second submatch and so on. The $x value typically persists until another regular expression is encountered. Examples:
Vi has been around for 30 years, and it's still there
> I do have the parenthesis library working which highlights the
> matching parenthesis but if the matching parenthesis is out
> of the page how do I get to it without moving the cursor ??
As you see, we have the cursor positioned at the start of the call. Now imagine that we want to extract this and assign it to a local variable. The first part is selecting the relevant call, then copying and deleting it to move above, typing the var name, and moving above to type the declaration. In regular editing models, you will play hunt-and-peck with Ctrl-Right and left/right until you get it exactly right. Not with vi or vim. The '%' motion moves from a parenthesis (or similar grouping character) to its matching one - but if you're not positioned at one of these special characters, it will scan character by character to the right, until the first one is found, and then moving to the character matching that one. So, in the above situation, it will move to the right closing parenthesis!
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The multis actually apply to the previous element in the regular expression - this can be a character (the examples we've just seen), any of the atoms described below (sets, character classes, etc...) and it can also be a subexpression delimited by parenthesis.
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You can capture this by redirecting standard output:If the program might generate an error, you can capture thisby using the special combination">&." This merges standard error with standard output:This type of conditional operation can be enclosed in parenthesisto keep standard input flowing through the different programs.
how to disable the highlighting of parenthesis matching
In these examples, the parenthesis are used to specify a list:These show expressions:This is an example of creating a subshell:And this is an example of grouping:And here is an example where the parenthesis have two different meanings:I've tried to combine several of these uses into one statement, andit generates errors.
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