正则符号集:
Symbol |
Description |
* |
Matches zero or more occurrences |
| |
Alteration operator for specifying alternative matches |
^/$ |
Matches the start-of-line/end-of-line |
[ ] |
Bracket expression for a matching list matching any one of the expressions represented in the list |
{m} |
Matches exactly m times |
{m,n} |
Matches at least m times but no more than n times |
[: :] |
Specifies a character class and matches any character in that class |
\ |
Can have 4 different meanings: 1. Stand for itself. 2. Quote the next character. 3. Introduce an operator. 4. Do nothing. |
+ |
Matches one or more occurrences |
? |
Matches zero or one occurrence |
. |
Matches any character in the supported character set, except NULL |
() |
Grouping expression, treated as a single subexpression |
[==] |
Specifies equivalence classes |
\n |
Back-reference expression |
[..] |
Specifies one collation element, such as a multicharacter element |
正则函数集:
REGEXP_LIKE (srcstr, pattern [,match_option])
REGEXP_INSTR (srcstr, pattern [, position [, occurrence
[, return_option [, match_option]]]])
REGEXP_SUBSTR (srcstr, pattern [, position
[, occurrence [, match_option]]])
REGEXP_REPLACE(srcstr, pattern [,replacestr [, position
[, occurrence [, match_option]]]])
示例:
SQL> select first_name,last_name from employees
2 where regexp_like (first_name,'^Ste(v|ph)en$');
FIRST_NAME LAST_NAME
-------------------- -------------------------
Steven King
Steven Markle
Stephen Stiles
SQL> select street_address,regexp_instr(street_address,'[^[:alpha:]]') from locations where regexp_instr(street_address,'[^[:alpha:]]')>1;
STREET_ADDRESS
----------------------------------------
REGEXP_INSTR(STREET_ADDRESS,'[^[:ALPHA:]]')
-------------------------------------------
Magdalen Centre, The Oxford Science Park
9
Schwanthalerstr. 7031
16
Rua Frei Caneca 1360
4
STREET_ADDRESS
----------------------------------------
REGEXP_INSTR(STREET_ADDRESS,'[^[:ALPHA:]]')
-------------------------------------------
Murtenstrasse 921
14
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