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!! +exec+ +var+ +string+
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!! +exec+ +var+ +string+
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$lst_tit replace$lst_titend$type_both
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tit:replace
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  $(lst_syntax)replace [internal] $emph s1 $emphend by $emph s2 $emphend in $emph
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  string$emphend<br/>
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type:$type_both
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  </span>or <span class="tt">!replace $emph obj$emphend $emph ident$emphend by
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syntax:!replace [internal] `s1' by `s2' in `string'<br/>\
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  $emph s$emphend in $emph string$emphend</span>
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  or <span class="tt">!replace `obj' `ident' by `s' in `string'</span>
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  $lst_mean String manipulation. <p>
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mean:String manipulation. <p>\
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  Under the first syntax, variable substitution is first done on
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  Under the first syntax, variable substitution is first done on `string'.\
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  $emph string$emphend. Then all occurences of substring $emph s1$emphend
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  Then all occurences of substring `s1' are replaced by `s2'. <br/>\
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  are replaced by $emph s2$emphend. <br/>
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  When the keyword $emph internal $emphend is absent,
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  the Linux utility $emph sed$emphend is called to make the replacements,
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  When the keyword `internal' is absent, the Linux utility `sed' is called to make the replacements,\
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  therefore regular expressions are accepted in $emph s1$emphend and
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  therefore regular expressions are accepted in `s1' and `s2'.\
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  $emph s2$emphend. Please refer to the man page of $emph sed$emphend for
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  Please refer to the man page of `sed' for details. </p><p>\
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  details. </p><p>
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  Under the second syntax, $emph obj$emphend can be $emph char$emphend,
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  Under the second syntax, `obj' can be `char', `word', `item' or `line'.\
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  $emph word$emphend,
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  $emph item$emphend or $emph line$emphend. Then the word, item or line
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  identified by $emph ident$emphend in $emph string$emphend is replaced
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  Then the word, item or line identified by `ident' in `string' is replaced\
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  by $emph s$emphend, after variable substitutions. <br/>
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  by `s', after variable substitutions. <br/>\
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  $emph ident$emphend can be a string, in this case all objects
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  `ident' can be a string, in this case all objects (words, items or lines) matching `ident' \
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  (words, items or lines) matching
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  $emph ident$emphend will be replaced. It can also be a number (positive or
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  will be replaced. It can also be a number (positive or negative integer `n'), preceded\
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  negative integer $emph n$emphend), preceded
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  by the word $emph number$emphend. In this case the object
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  by the word `number'. In this case the object number `n' will be replaced.\
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  number $emph n$emphend will be replaced. (In the case where n&lt;0,
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  it is the last -n'th object which is replaced.)
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  (In the case where n&lt;0, it is the last -n'th object which is replaced.)\
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  </p>
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  </p>