extract all numbers from start of string?

Question

I have a table which contains some bad data I am trying to clean up.

An example of the fields is below

36234735HAN876

2342JOE9823

554444PUT003

What I want to do is remove all the numeric characters before the first alphabetical character so it would look like the below:

HAN876

JOE9823

PUT003

What would be the best way to achieve this? I have used the below method but this can only be used to extract ALL numeric from the string, not the ones before the alphabetical characters

How to get the numeric part from a string using T-SQL?

Thom A · Answer 1 · 2020-10-16T10:39:05.423

Use PATINDEX to find the first non-numeric character (or first alpha character, depending on the logic) and STUFF to remove them:

SELECT STUFF(V.YourString,1,ISNULL(NULLIF(PATINDEX('%[^0-9]%',V.YourString),0)-1,0),'')
FROM (VALUES('36234735HAN876'),
            ('2342JOE9823'),
            ('554444PUT003'),
            ('ABC123'))V(YourString)

If the logic is the first alpha character, instead of the first non-numeric, then the pattern would be [A-z].

The NULLIF and ISNULL are in there for when/if the string starts with a alpha/non-numeric and thus doesn't cause STUFF to error due to the 3rd parameter being -1. The is demonstrated with the additional example I put into the sample data ('ABC123').

score 1 · Answer 2 · answered Oct 16 '20 at 10:30

You could achieve this using PATINDEX to locate the first position of an alphabetical character in the string, and then use SUBSTRING to only return the characters after that position:

CREATE TABLE #temp (val VARCHAR(50));
INSERT INTO #temp VALUES ('36234735HAN876'), ('2342JOE9823'), ('554444PUT003'), ('TEST1234');

SELECT  val,
        SUBSTRING(val, PATINDEX('%[A-Z]%', val), LEN(val)) AS output
  FROM  #temp;

DROP TABLE #temp;

Outputs:

val             output
36234735HAN876  HAN876
2342JOE9823     JOE9823
554444PUT003    PUT003
TEST1234        TEST1234

Note that I have created a temporary table with a column named val. You should change this to work with whatever the actual column is called.

About case sensitivity: If you are using a non-case sensitive collation this will work without issue. If your collation is case sensitive then you may need to alter the pattern being matched to cater for upper- and lower-case letters.

extract all numbers from start of string?

2 Answers2