Mikroelektronika MIKROE-350 Fiche De Données

You can specify a character class, by enclosing a list of characters in [], which will
match any of the characters from the list. If the first character after the "[" is "^", the
class matches any character not in the list. 

count[aeiou]r

finds strings 

'countar', 'counter'

, etc. but not 

'countbr', 'countcr'

, etc. 

count[^aeiou]r

finds strings 

'countbr', 'countcr'

, etc. but not 

'countar', 'counter'

, etc. 

Within a list, the 

"-"

character is used to specify a range, so that a-z represents all

characters between 

"a"

and 

"z"

, inclusive. 

If you want 

"-"

itself to be a member of a class, put it at the start or end of the list,

or precede it with a backslash. 
If you want 

']'

, you may place it at the start of list or precede it with a backslash. 

[-az]

matches 

'a', 'z'

and 

'-'

[az-]

matches 

'a', 'z' 

and 

'-'

[a\-z]

matches 

'a', 'z'

and 

'-' 

[a-z]

matches all twenty six small characters from 

'a'

to 

'z'

[\n-\x0D]

matches any of 

#10,#11,#12,#13.

[\d-t]

matches any digit, 

'-' 

or 

't'

. 

[]-a]

matches any char from

']'..'a'. 

Metacharacters are special characters which are the essence of regular expres-
sions. There are different types of metacharacters, described below.

^

- start of line 

$

- end of line 

\A

- start of text 

\Z

- end of text 

.

- any character in line 

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 2