Home/ Questions/Q 893115
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-15T14:10:06+00:00

I’m currently trying to learn regular expressions with some simple "real world" examples. Take

  • 0

I’m currently trying to learn regular expressions with some simple "real world" examples.

Take in consideration the following string:

Mozilla/5.0 (Windows; U; Windows NT
5.0; en-US; rv:1.9.2a1pre) Gecko

I want to find the RV value (1.9.2a1pre). I need to apply the following rules:

  1. RV: can be in any case (RV, rv, rV, Rv…).
  2. RV: can be anywhere in the string.
  3. The RV: value ends with either a closing parenthesis, any whitespace (including linebreak), a semicolon or the end of string.

So far I did:

/rv:[.][\)]?/i

but it’s not working (I must be far from the "true" solution)…

The expression must work with PHP preg_match.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team
    /rv\s*:\s*([^;)\s]+)/i

    will match rv, followed by a : (which may be surrounded with whitespace), then a run of characters other than ;, ) and whitespace (including newlines). The match result (after rv:) will be captured in backreference no. 1.

    • 0