Sybase InfoMaker 11.5, CD, Win, ENG Especificações descarregar pdf (Página 725)

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CHAPTER 24 DataWindow Expression and InfoMaker Functions

Users Guide 703

The following tables explain the meaning and use of these metacharacters:

The metacharacters asterisk (*), plus (+), and question mark (?) are unary

operators that are used to specify repetitions in a regular expression:

Metacharacter Meaning Example

Caret (^) Matches the beginning of

a string

^C matches C at the

beginning of a string.

Dollar sign ($) Matches the end of a

string

s$ matches s at the end of a

string.

Period (.) Matches any character . . . matches three

consecutive characters.

Backslash (\) Removes the following

metacharacter’s special

characteristics so that it

matches itself

\$ matches $.

Character class (a group

of characters enclosed in

square brackets [ ])

Matches any of the

enclosed characters

[AEIOU] matches A, E, I, O,

or U.

You can use hyphens to

abbreviate ranges of

characters in a character

class. For example, [A-Za-z]

matches any letter.

Complemented character

class (first character

inside the square

brackets is a caret)

Matches any character

not in the group

following the caret

[^0-9] matches any character

except a digit, and [^A-Za-z]

matches any character

except a letter.

Metacharacter Meaning Example

* (asterisk) Indicates zero or more

occurrences

A* matches zero or more As

(no As, A, AA, AAA, and so

on)

+ (plus) Indicates one or more

occurrences

A+ matches one A or more

than one A (A, AAA, and so

on)

? (question mark) Indicates zero or one

occurrence

A? matches an empty string

(“”) or A

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