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Top Forums UNIX for Beginners Questions & Answers Replace string2 by string3 where string1 is found in line Post 303039408 by MadeInGermany on Thursday 3rd of October 2019 09:32:48 AM
Old 10-03-2019
To replace the 2nd string2 is easy
Code:
sed '/string1/s/string2/string3/2' TextFile

But this searches string1 throughout the line, then starts over and substitutes the 2nd string2 from the beginning of the line.
If you really want the 1st string2 after string1, then you have to include string1 into the substitution command.
I suggest perl and its minimum match. perl -pe works a bit like sed:
Code:
perl -pe 's/(string1.*?)string2/${1}string3/' TextFile

The $1 refers to what was captured in the 1st ( ) group.
The .*? is a non-greedy .* (any character any times).
 

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CTYPE_GRAPH(3)								 1							    CTYPE_GRAPH(3)

ctype_graph - Check for any printable character(s) except space

SYNOPSIS
bool ctype_graph (string $text) DESCRIPTION
Checks if all of the characters in the provided string, $text, creates visible output. PARAMETERS
o $text - The tested string. RETURN VALUES
Returns TRUE if every character in $text is printable and actually creates visible output (no white space), FALSE otherwise. EXAMPLES
Example #1 A ctype_graph(3) example <?php $strings = array('string1' => "asdf ", 'string2' => 'arf12', 'string3' => 'LKA#@%.54'); foreach ($strings as $name => $testcase) { if (ctype_graph($testcase)) { echo "The string '$name' consists of all (visibly) printable characters. "; } else { echo "The string '$name' does not consist of all (visibly) printable characters. "; } } ?> The above example will output: The string 'string1' does not consist of all (visibly) printable characters. The string 'string2' consists of all (visibly) printable characters. The string 'string3' consists of all (visibly) printable characters. NOTES
Note If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative val- ues have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string contain- ing the decimal digits of the integer. SEE ALSO
ctype_alnum(3), ctype_print(3), ctype_punct(3). PHP Documentation Group CTYPE_GRAPH(3)
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