Re: Search and replace

$line =~ s/input .*clk/output .*clk/g;

The first part of s/// is a regular expression but the second part is a string. It is essentially s/REGEX/STRING/. Since (in the first part of your task, which is the only part your code attempts to address) there are no complications, you can ignore the rest of the pattern and just do this:

    $line =~ s/input/output/;
[download]

That should get you farther along. For the general case you would need to use capture groups.

🦛

Comment on Re: Search and replace Select or Download Code

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Re^2: Search and replace by kulua (Initiate) on May 23, 2021 at 15:39 UTC
Hi Hippo , I want to change the string to output when the string clk matches not the input to output Can you provide me good tutorial for reg expression ?	[reply]
Re^3: Search and replace by hippo (Archbishop) on May 23, 2021 at 16:10 UTC
You could try Regular Expressions Tutorial, the Basics (for BEGINNERS) which is listed on our Tutorials page under the Pattern Matching, Regular Expressions, and Parsing section. There's also the official tutorial at perlretut. Enjoy. 🦛	[reply]
Re^3: Search and replace by tybalt89 (Monsignor) on May 23, 2021 at 16:09 UTC
`$line =~ s/input(?= .*clk)/output/g;` [download] Untested since no test cases were provided.	[reply] [d/l]