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POHow to get egrep to match ^ for every line (as it should be)
 

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  1. POHow to get egrep to match ^ for every line (as it should be)
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    <p>I have a file containing these lines:</p> <pre><code>SOME COMMAND 34 XXXXX ; ; a comment which may contain a : sometext001 : X00 : 1 ; : X01 : 1 ; : X11 : 1 ; </code></pre> <p>And want to retrieve <code>sometext001</code> with grep/egrep.</p> <p>Using the regex <code>^\s*[^:\s;]+\s*:</code> </p> <p>(in words: starting at the beginning of the line with some or none whitespace, followed by at least one character not a whitespace, colon or semicolon followed again by some or none whitespaces followed by a colon)</p> <p>I'm able to match the text (including the following :) using an online regex tester <a href="http://regexr.com?35eam" rel="nofollow">http://regexr.com?35eam</a> if I enable multiline support.</p> <p>I was under the impression that grep/egrep works line by line anyway, so why does the regex not work when used with egrep on a file containing this example?</p> <p>Is there another way to achive the desired result with egrep or, if that's not possible, with another one-liner callable from a shell script?</p> <p><strong>Update:</strong> although the proposed change of the regex to <code>^[[:space:]]*[^[:space:];]+[[:space:]]*:</code> matches the lines specified, it it still matches twice in that line, once for <code>sometext001 :</code> and once for <code>X00 :</code> as evident when using the -o option to egrep. How to solve this?</p> <p><strong>Update:</strong> The test file contained exactly the text given above. The command line was <code>egrep -o '^([[:space:]]*[^:[:space:];]+[[:space:]]*:)' test.txt</code> (also tried without the () pair). Output is</p> <pre><code> sometext001 : X00 : </code></pre>
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    1. COyou are correct, grep works line by line. You can't use grep on multiline (as you are trying to do here)
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      1. USKingJohnno
    2. CO@KingJohnno Can you explain to my what is multi-line in my regex? I'm only trying to match characters in one line of text. No fancy look-ahead or look-behind, no explicit newlines etc.
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      1. POHow to get egrep to match ^ for every line (as it should be)
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    3. COI miss understood your code that you posted - I believed the ':' to indicate the new line. Sorry for any confusion.
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