Home/ Questions/Q 4609036
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-22T00:55:47+00:00

What would be a RegExp equivalent of substring from position x to position y

  • 0

What would be a RegExp equivalent of substring from position x to position y?

For example: 

0001..STACK.OVERFLOW...IS.AWESOME.13052011

I know that the value of a field called 'status' in this fixed length string is 8 characters starting from position 26. What would a regex in JavaScript (and Java) look like to get the "AWESOME" string?

I’m trying to build a parser of mainframe screens that come over JMS as fixed length strings. And the idea is to write a UI where a user could highlight a section of a string, fill the ‘field name’ field, select type (int, String..) and have a Java class generated automatically.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team
    .{26}(.{8})

    The first .{26} eats the first 26 characters no matter what they are. The (.{8}) captures the next 8 characters and stores them. For Javascript you can use

    var matches= /.{26}(.{8})/.exec("0001..STACK.OVERFLOW...IS.AWESOME.13052011")

    and matches[1] will be the substr that you’re looking for. (matches[0] always contains the entire matched string)

    note that the .s can be replaced by character classes if you want (ex. [\w]{26}[\w]{8})

    • 0