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Top Forums Shell Programming and Scripting Bash script - coloring reg. expressions in text Post 302723627 by JohnnyM77 on Tuesday 30th of October 2012 12:30:26 PM
Old 10-30-2012
Bash script - coloring reg. expressions in text

Hi all,
is there anyone good at bash who will help me?

I need to use syntax ${string/pattern/replacement}
The problematic part where I am stuck is:

Code:
#!bin/bash
text="A cat is on a mat."
exp="cat"
newexp="SOMECODEcatSOMECODE"

newtext=${${text}/${exp}/${newexp}}
 == > ERROR "wrong substitution"
newtext=${$text/$exp/$newexp}
 == > ERROR "wrong substitution"
newtext=${"cat is here"/"cat"/"dog"}
 == > newtext is EMPTY STRING - Why not "dog is here" ?

Any ideas what i am doing wrong? Or would you approach it differently?
Thanks for your help.

As for the use, I am to create a bash file colorscript.sh that
1) Gets pairs color-regex, such as: r 'bar[a-z]*\>' g 'text' b 'reg'
2) Reads user's input and colors each input line properly.
 

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WORDWRAP(3)								 1							       WORDWRAP(3)

wordwrap - Wraps a string to a given number of characters

SYNOPSIS
string wordwrap (string $str, [int $width = 75], [string $break = "0], [bool $cut = false]) DESCRIPTION
Wraps a string to a given number of characters using a string break character. PARAMETERS
o $str - The input string. o $width - The number of characters at which the string will be wrapped. o $break - The line is broken using the optional $break parameter. o $cut - If the $cut is set to TRUE, the string is always wrapped at or before the specified $width. So if you have a word that is larger than the given width, it is broken apart. (See second example). When FALSE the function does not split the word even if the $width is smaller than the word width. RETURN VALUES
Returns the given string wrapped at the specified length. EXAMPLES
Example #1 wordwrap(3) example <?php $text = "The quick brown fox jumped over the lazy dog."; $newtext = wordwrap($text, 20, "<br /> "); echo $newtext; ?> The above example will output: The quick brown fox<br /> jumped over the lazy<br /> dog. Example #2 wordwrap(3) example <?php $text = "A very long woooooooooooord."; $newtext = wordwrap($text, 8, " ", true); echo "$newtext "; ?> The above example will output: A very long wooooooo ooooord. Example #3 wordwrap(3) example <?php $text = "A very long woooooooooooooooooord. and something"; $newtext = wordwrap($text, 8, " ", false); echo "$newtext "; ?> The above example will output: A very long woooooooooooooooooord. and something SEE ALSO
nl2br(3), chunk_split(3). PHP Documentation Group WORDWRAP(3)
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