We had written an SQL script to make the corrections, for which I have modifed a function found in the link http://blog.sqlauthority.com/2007/07/07/sql-server-convert-text-to-numbers-integer-cast-and-convert/ . This function will return a table with all the numbers found on the input text.
SELECT Number FROM Dbo.[GetNumbersFromText]('The dimension is 230x40x30')
SELECT Number FROM Dbo.[GetNumbersFromText]('Give me 120 this week and 50 next week')
CREATE FUNCTION [dbo].[GetNumbersFromText](@String VARCHAR(2000))
RETURNS @Number TABLE (Number INT)
DECLARE @Count INT
DECLARE @IntNumbers VARCHAR(1000)
SET @Count = 0
SET @IntNumbers = ''
WHILE @Count <= LEN(@String)
--Find a numeric charactor
IF SUBSTRING(@String,@Count,1) >= '0' AND SUBSTRING(@String,@Count,1) <= '9'
SET @IntNumbers = @IntNumbers + SUBSTRING(@String,@Count,1)
--If the next charactor is not a numeric one, the current number ends, so add a separator
IF (SUBSTRING(@String,@Count+1,1) < '0'OR SUBSTRING(@String,@Count+1,1) > '9') AND SUBSTRING(@String,@Count,1) >= '0' AND SUBSTRING(@String,@Count,1) <= '9'
SET @IntNumbers = @IntNumbers + ','
SET @Count = @Count + 1
---Split string to give a table with the numbers in the text
INSERT INTO @Number
SELECT DISTINCT items FROM dbo.Split(@IntNumbers, ',')
Note that this function uses a scalar valued function dbo.Split which splits a varchar at a given separator. You may already have this or a similar function, else it is a google search away.