Databases
StackOverflow2013
Postsdbo
POunix: how to tell if a string matches a regex
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POunix: how to tell if a string matches a regex
    primarykey
    data
    text
    <p>Trying out <a href="http://fishshell.com/" rel="noreferrer">fish shell</a>, so I'm translating my bash functions. The problem is that in one case, I'm using bash regexes to check if a string matches a regex. I can't figure out how to translate this into fish.</p> <p><a href="https://github.com/JoshCheek/dotfiles/blob/d1662522/dotfiles/profile#L49" rel="noreferrer">Here</a> is my example.</p> <pre><code>if [[ "$arg" =~ ^[0-9]+$ ]] ... </code></pre> <ul> <li>I looked into <strong>sed</strong>, but I don't see a way to get it to set its exit status based on whether the regex matches.</li> <li>I looked into delegating to <strong>Ruby</strong>, but again, getting the exit status set based on the match requires making this really ugly (see below).</li> <li>I looked into delegating back to <strong>bash</strong>, but despite trying maybe three or four ways, never got that to match.</li> </ul> <p><strong>So, is there a way in *nix to check if a string matches a regex, so I can drop it into a conditional?</strong></p> <hr> <p>Here is what I have that currently works, but which I am unhappy with:</p> <pre><code># kill jobs by job number, or range of job numbers # example: k 1 2 5 # example: k 1..5 # example: k 1..5 7 10..15 # example: k 1-5 7 10-15 function k for arg in $argv if ruby -e "exit ('$arg' =~ /^[0-9]+\$/ ? 0 : 1)" kill -9 %$arg else set _start (echo "$arg" | sed 's/[^0-9].*$//') set _end (echo "$arg" | sed 's/^[0-9]*[^0-9]*//') for n in (seq $_start $_end) kill -9 %"$n" end end end end </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USJoshua Cheek
    1. USJoshua Cheek
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POunix: how to tell if a string matches a regex
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload