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Full Discussion: Swapping in VI editor
Top Forums UNIX for Dummies Questions & Answers Swapping in VI editor Post 302328508 by fpmurphy on Wednesday 24th of June 2009 12:18:44 PM
Old 06-24-2009
Perhaps an example would help you. Suppose you have the following text file
Code:
abcdefg
faaaag
accxxcck
abbde

and want to use vi to search and replace all instances of 'b', 'c', 'd' and 'e' with 'Q',
you can do with the following command ":%s/[b-e]/Q/g' which results in
Code:
aQQQQfg
faaaag
aQQxxQQk
aQQQQ

Here is an except from a typical vi man page regarding substitute:
Code:
    [range] s[ubstitute] [/pattern/replace/] [options] [count] [flags]
    [range] & [options] [count] [flags]
    [range] ~ [options] [count] [flags]
        Make substitutions. In the substitution string, the characters ~ and %
        may have special meanings. If the entire replace pattern is a percent
        sign (%), the previous replacement pattern is used. (This can be
        useful for repeating substitutions that contain back references.) The
        special character ~ inserts the previous replacement string into this
        replacement string.
        The options can be any of the following:

        c
            Ask for confirmation before replacing the text.

        g
            Perform the replacement on all occurrences of the regular
            expression on the line.

        r
            If no regular expression was specified, use the most recent
            regular expression (used for a search) rather than the same
            regular expression as used for the last substitute command.

 

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MB_EREG_REPLACE(3)							 1							MB_EREG_REPLACE(3)

mb_ereg_replace - Replace regular expression with multibyte support

SYNOPSIS
string mb_ereg_replace (string $pattern, string $replacement, string $string, [string $option = "msr"]) DESCRIPTION
Scans $string for matches to $pattern, then replaces the matched text with $replacement PARAMETERS
o $pattern - The regular expression pattern. Multibyte characters may be used in $pattern. o $replacement - The replacement text. o $string - The string being checked. o $option - Matching condition can be set by $option parameter. If i is specified for this parameter, the case will be ignored. If x is specified, white space will be ignored. If m is specified, match will be executed in multiline mode and line break will be included in '.'. If p is specified, match will be executed in POSIX mode, line break will be considered as normal character. If e is specified, $replacement string will be evaluated as PHP expression. RETURN VALUES
The resultant string on success, or FALSE on error. NOTES
Note The internal encoding or the character encoding specified by mb_regex_encoding(3) will be used as the character encoding for this function. Warning Never use the e modifier when working on untrusted input. No automatic escaping will happen (as known from preg_replace(3)). Not taking care of this will most likely create remote code execution vulnerabilities in your application. SEE ALSO
mb_regex_encoding(3), mb_eregi_replace(3). PHP Documentation Group MB_EREG_REPLACE(3)
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