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SQL Optimizer for DB2 LUW 4.4.1 - Release Notes

Regular Expression

Regular expressions are characters that customize a text search string. They formulate a more complex search.

You must select the Regular expression checkbox to use these advanced search features.

Type of Search

Search Characters

Location of character in the search string

Explanation

Text at the beginning of line.

^ (circumflex)

 

Example:

 

^select

Beginning

A circumflex at the beginning of the text search string finds the text only if it is the first non whitespace text on a line.

Text at the end of line.

$ (dollar sign)

 

Example:

 

error$

End

A dollar sign at the end of the expression matches the end of a line.

Single character wildcard

. (period)

 

Example:

 

f.r

matches "for" and "far"

Any place

A period represents any character.

Class of character

: (colon)

 

Example:

 

SQL:a

finds SQLSTATE or SQLTABLE

 

SQL:d

Finds SQL1 or SQL3

Any place

A colon matches a class of characters described by the character following the colon. 

:a

matches any alphabetic character

:d

matches a digit 

:n

matches an alphanumeric character

": "

matches a space, tab, or other control character or punctuation mark (ASCII 0x01 - 0x40)

Search for Regular Expression characters

\ (backslash)

 

Example:

 

\^ searches for ^

 

\\ searches for \.

Any place

A backslash before a wildcard character searches for actual character and does not use the character as a wildcard.

Search for multiple characters in one position

[...] (characters within brackets)

 

Example:

 

r[au ]n

finds run or ran

Any place

Characters enclosed in brackets matches any one character that appears in the brackets, but no others. Nesting of brackets is not supported.

Search for any character but the specified characters in one character position

[^] (circumflex within square brackets)

 

Example:

 

r[^oa ]n

finds run, r n, rin , etc but not ron or ran.

Any place

A circumflex at the start of the string in square brackets means NOT. The expression matches any character except the characters in the string and the carriage return (ASCII 0x0D) or line feed (ASCII 0x0A).

Search for a range of characters in one character position

[-] (hyphen within the brackets)

 

 

Example:

 

SQL[1-3]

finds SQL1, SQL2 and SQL3

Any place

A hyphen within the brackets signifies a range of characters. Note: the range must be in a progressive order, i.e. "[a-x]" matches any character from a through x while "[x-a]" does not match anything.

 

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