"Extract Information Regular Expression query type failed (Text Processing)"
New Altair Community Member
Updated by Jocelyn
Dear All!
I have a simple process: Create Document + Extract Information. I create a simple text: "string1 string2 string3 string4" and I use a simple regular expression: ^\S* so I want to extract the first string from my document. And RapidMiner gives the following error: Process Failed. No group 1.
If I use not a Regular Expression query type but a String Matching one and I set string2 and string4 at query expression, then I get string3 as result. So String Matching works well. But Regular Expression does not.
Can anybody check this why this query type does not work? Or did I make any mistake? (what?)
If I use Regular Region and set eg. ^\S* and .* as region delimiter, then RapidMiner gives the correct result: string1 string2 string3 string4.
Only the normal Regular Expression does not work........
Of course if I use Regular Region and ^\S* and '\ ' as the two delimiter, then I will get the result I want: string1
But why Regular Expression query type does not work?
Thank you for reading it and trying to help me!
I have a simple process: Create Document + Extract Information. I create a simple text: "string1 string2 string3 string4" and I use a simple regular expression: ^\S* so I want to extract the first string from my document. And RapidMiner gives the following error: Process Failed. No group 1.
If I use not a Regular Expression query type but a String Matching one and I set string2 and string4 at query expression, then I get string3 as result. So String Matching works well. But Regular Expression does not.
Can anybody check this why this query type does not work? Or did I make any mistake? (what?)
If I use Regular Region and set eg. ^\S* and .* as region delimiter, then RapidMiner gives the correct result: string1 string2 string3 string4.
Only the normal Regular Expression does not work........
Of course if I use Regular Region and ^\S* and '\ ' as the two delimiter, then I will get the result I want: string1
But why Regular Expression query type does not work?
Thank you for reading it and trying to help me!