Lets say I have a 100 characters line. I have a REGEX matching correctly a string of lets say 25 characters in the middle (neither at the beginning nor at the end) of the line. How can I match the last 5 characters of above 25 match in the middle?

CURRENT REGEX: (dBm)\s .{7})(\b)

REAL EXAMPLE:

Lines:

Tx Output Power (dBm) -2.31 3.50 0.50 -8.20 -12.20

Rx Optical Power (avg dBm) -3.72 3.50 0.50 -14.40 -18.39

I am matching the following with my REGEX - (dBm)\s .{7})(\b)

Tx Output Power (dBm) -2.31 3.50 0.50 -8.20 -12.20

Rx Optical Power (avg dBm) -3.72 3.50 0.50 -14.40 -18.39

I am only really interested on:

Tx Output Power (dBm) -2.31 3.50 0.50 -8.20 -12.20

Rx Optical Power (avg dBm) -3.72 3.50 0.50 -14.40 -18.39

Thanks

CodePudding user response：

Regex

.*\([^\)]*\) ([^ ] ).*

Result

-2.31

-3.72

-2.31

-3.72

-2.31

-3.72

Example https://regex101.com/r/S9NO4o/1

CodePudding user response：

You could use a capture group:

\([^()]*dBm\)\s (-?\d (?:)\.\d*)\b

Explanation

• \( Match (
• [^()]* Match 0 chars other than ( or )
• dBm\) Match dBm)
• \s Match 1 whitespace chars
• ( Capture group 1
  • -?\d (?:)\.\d* Match optional -, then 1 digits with an optional decimal part
• ) Close group 1
• \b A word boundary to prevent a partial word match

Regex demo