INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

awk match substitution using regexp "^" and a variable name

awk match substitution using regexp "^" and a variable name

awk match substitution using regexp "^" and a variable name

(OP)
Hi,

I want to do a gawk statement were the following is matched but it does not work:

variable="partners";
temp="(partners ?x1 ?x2";
if ( temp ~ /^\(/variable/ ?/ ){
print hello;
}

The following works, so the problem is getting the variable value of "partners" inside the regexp.

if ( temp ~ /^\(partners ?/ )
I tried using match function instead, but keep getting errors, e.g:
if (match(temp,"^\("variable" ?") ){
I get the error:
gawk: ../../../scripts/Hikin-3Dto2D-PDDL.awk:147: fatal: :, [., or [=: /^(partners ?/

To summarize, can I do a search in gawk that uses both regexp "^" for beginning of string and also a variable as part of the string to match???

Thanks!

RE: awk match substitution using regexp "^" and a variable name

Hi

You have to specify the regular expression as string to be able to concatenate it with a variable :

CODE --> Awk

if ( temp ~ "/^\\(" variable " ?" ){ 
Just watch out the escaping.

Feherke.
feherke.github.io

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!

Resources

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close