Questioning REGEXP_SUBSTR, regular expressions

With the expression below, I expect to come back the first 4 words and do not understand why it is not doing.

db > select regexp_substr('This is a sample text string', '([[:alpha:]]+){3,4}') from dual;
REGE
----
This

This works as expected.

db > select regexp_substr('This is a sample text string', '([[:alpha:]]+ ){3,4}') from dual;
REGEXP_SUBSTR('TH
-----------------
This is a sample

Hello

Solomon Yakobson says:

Frank Kulash wrote:

If you are looking for 3 or 4 instances of 1 or more letters, without anything in addition to the letters between them.  Any group of 3 or more consecutive letters matches.  For example,.

  1. "Th" as the 1st appearance of 1 or more letters,
  2. 'i' as the 2nd appearance of 1 or more letters, and
  3. of ' as the 3rd appearance of 1 or more letters

is a substring that matches the pattern you described.

In fact T is the 1st appearance of 1 or several letters, h is the second, I ranked third and s are defined. Otherwise:

SQL > select regexp_substr ('the following is an example of text string', ' ([[: alpha:]] +) {3,4}') of the double
2.

REG
---
The

SQL >

returns no rows.

Not that it is important for the OP's question, but I think the way I presented it is more precise.

How can tell us if 'This' match of the 4 occurrences (all 1 character) or 3 occurrences (1 with 2 characters and 2 with 1 character each)?

In more general terms, when we say something like

(expr +) {x, y}

is '+' more greedy than "{x, y}.

It seems to me that '+' is dishonest in this case.  Consider this query:

WITH sample_data AS

(

SELECT "This is an example of text string" dual UNION ALL STR

SELECT 'the following is an example of text string' FROM dual UNION ALL

SELECT 'Fubar' double UNION ALL

SELECT 'chat' FROM dual

)

SELECT str

REGEXP_REPLACE (str

, ' ([[: alpha:]] {1,2})([[:alpha:]]+) ([[: alpha:]] +)([[:alpha:]]+)?'

, "\1=1;\2=2;\3=3;\4=4".

) And matches

OF sample_data

;

which produces this output:

STR MATCHES

------------------------------------- ------------------------------

This is an example of text string Th = 1; i = 2; s = 3; = 4 is a samp = 1; l =

2; e = 3; 4 = = you 1; x = 2; t = 3; = 4 = stri

1; n = 2; g = 3; = 4

The following is an example of text string T = 1; h = 2; e = 3; = 4 followi = 1; n = 2; g

= 3 ; = 4 is a samp = 1; l = 2; e = 3; = 4 t

e = 1; x = 2; t = 3; = stri 4 = 1; n = 2; g = 3;

= 4

Fubar Fub = 1; a = 2; r = 3; = 4

cat                                  c=1;a=2;t=3;=4

In this case, '+' appears to be labels as "{3.4}.

I don't have not seen this documented anywhere, but it seems it's because + gets to go first in the model.  In other words, there is nothing to inherently rapacity on ' + '.  If we change the first '+' above "{1,9}", like this

WITH sample_data AS

(

SELECT "This is an example of text string" dual UNION ALL STR

SELECT 'the following is an example of text string' FROM dual UNION ALL

SELECT 'Fubar' double UNION ALL

SELECT 'chat' FROM dual

)

SELECT str

REGEXP_REPLACE (str

, ' ([[: alpha:]]{1,9}) ([[: alpha:]] +) ([[: alpha:]] +)([[:alpha:]]+)?'

, "\1=1;\2=2;\3=3;\4=4".

) And matches

OF sample_data

;

the result remains the same.

Of course, is using the first query I posted above

(expr) (expr) (expr) (expr)?

It is possible that

(expr) {3,4}

which is what OP posted, is handled differently.

Tags: Database

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