Find Substring - SQL - sql

Question

I need to find a substring that is in a text field that is actually partially xml. I tried converting it to xml and then use the .value method but to no avail.
The element(substring) I am looking for is a method name that looks like this:
AssemblyQualifiedName="IPMGlobal.CRM2011.IPM.CustomWorkflowActivities.ProcessChildRecords,
where the method at the end "ProcessChildRecords" could be another name such as "SendEmail". I know I can use the "CustomWorkflowActivities." and the , (comma) to find the substring (method name) but not sure how to accomplish it. In addition, there may be more that one instance listed of the **"CustomWorkflowActvities.<method>"**
Some Clarifications:
Below is my original query. It returns that first occurrence in each row but no additional. For example I might have in the string '...IPM.CustomWorkflowActivities.ProcessChildRecords...' and
'...IPM.CustomWorkflowActivities.GetworkflowContext...'
The current query only returns Approve Time Process,
ipm_mytimesheetbatch,
ProcessChildRecords
SELECT WF.name WFName,
(
SELECT TOP 1 Name
FROM entity E
WHERE WF.primaryentity = E.ObjectTypeCode
) Entity,
Convert(xml, xaml) Xaml,
SUBSTRING(xaml, Charindex('CustomWorkflowActivities.', xaml) + Len('CustomWorkflowActivities.'), Charindex(', IPMGlobal.CRM2011.IPM.CustomWorkflowActivities, Version=1.0.0.0', xaml) - Charindex('CustomWorkflowActivities.', xaml) - Len('CustomWorkflowActivities.'))
FROM FilteredWorkflow WF
WHERE 1 = 1
AND xaml LIKE '%customworkflowactivities%'
AND statecodename = 'Activated'
AND typename = 'Definition'
ORDER BY NAME

Answer 1

If you are using Oracle you could use REGEXP function:
WITH cte(t) as (
SELECT 'AssemblyQualifiedName="IPMGlobal.CRM2011.IPM.CustomWorkflowActivities.ProcessChildRecords,' FROM dual
)
SELECT t,
regexp_replace(t, '.*CustomWorkflowActivities.(.+)\,.*', '\1') AS r
FROM cte;
DBFiddle Demo
SQL Server:
WITH cte(t) as (
SELECT 'AssemblyQualifiedName="IPMGlobal.CRM2011.IPM.CustomWorkflowActivities.ProcessChildRecords,asfdsa'
)
SELECT t,SUBSTRING(t, s, CHARINDEX(',', t, s)-s)
FROM (SELECT t, PATINDEX( '%CustomWorkflowActivities.%', t) + LEN('CustomWorkflowActivities.') AS s
FROM cte
) sub;
DBFiddle Demo 2