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NAME
re_syntax - Tcl
_________________________________________________________________
DESCRIPTION
(regular expression )
RE DIFFERENT FLAVORS OF REs
(RE) POSIX (flavor): RE(``EREs'')RE(``BREs'')ERE egrep BRE ed
RE(``AREs'') ERE
grep BRE -E ERE egrep fgrep grep edsed BRElexAWK ERE
ARE BRE (backward)POSIX ERE ARE ERE ARE
REGULAR EXPRESSION SYNTAX
Tcl Henry Spencer POSIX 1003.2 () Perl5 ( Henry!)
Perl5 Henry Spencer
ARE `|'(branch)()
(constraint)(quantified atom)()()
(quantifier) :
*
+
?
{m} m
{m,} m
{m,n} m n ()m n
*? +? ?? {m}? {m,}? {m,n}?
(non-greedy) (MATCHING )
{ } (bound) m n 0 255(0 255)
:
(re) ( re ) re ()
ab* a b b* a(b)* a b ab (ab)*
(?:re)
()
() ()
(?:)
[chars]
(bracket expression) chars ( BRACKET EXPRESSIONS )
.
\k ( k alphanumeric ())\\
\c ( c alphanumeric ()) (escape)( ARE)ESCAPES )
{ `{'()
x x
(constraint) ESCAPES
^
$
(?=re) (positive lookahead) ( ARE) re
(?!re) (negative lookahead) ( ARE) re
()
RE `\'.
BRACKET EXPRESSIONS
`[]'()^()
`-'(collating sequence)()[0-9] ASCII a-c-e
-- (locale) LC_COLLATE
-- LC_COLLATE
] - [. .] ()('^')( ARE) '\fR''-' - ( ARE) '\' [ ()
[. .] (collating element)() () ^ ! (Tcl ) |
ch RE [[.ch.]]*c ( c ch) `chchcc'5 [^c]b `chb'( [^c] ch)
[= =] equivalence class (`[.'`.]') o o^ `[[=o=]]'`[[=o^=]]'`[oo^]' (Tcl |
Unicode )
[: :] character class (!):
alpha
upper
lower
digit
xdigit
alnum alphanumeric ()
print alphanumeric ( alnum)
blank tab
space
punct
graph
cntrl
(Tcl Unicode ) |
: [[:<:]] [[:>:]] alnum (_)ARE ()
ESCAPES
( ARE) \ : (entry) ARE alphanumeric \ ERE : alphanumeric \ \ ( ERE
ARE )
(Character-entry escapes) ( ARE) RE :
\a () C
\b C
\B \
\cX ( X ) 5 X 5
\e 'ESC' 033
\f C
\n C
\r C
\t tab C
\uwxyz
( wxyz ) Unicode U+wxyz
\Ustuvwxyz
( stuvwxyz ) 32 Unicode
\v tab C
\xhhh
( hhh ) 0xhhh ()
\0 0
\xy ( xy ()) 0xy
\xyz ( xyz ()) 0xyz
`0'-`9', `a'-`f', `A'-`F'. `0'-`7'.
\135 ASCII ] \135 ( C )( (quadrupling)) `\'
Class-shorthand escapes ( ARE) :
\d [[:digit:]]
\s [[:space:]]
\w [[:alnum:]_] ()
\D [^[:digit:]]
\S [^[:space:]]
\W [^[:alnum:]_] ()
W`\d', `\s', `\w' `\D', `\S', `\W' ([a-c[:digit:]] [a-c\d] [a- |
c^[:digit:]] [a-c\D] )
constraint escape (AREs only) :
\A ( `^' MATCHING )
\m
\M
\y
\Y
\Z ( `$' MATCHING )
\m ( m )back reference
\mnn ( m nn mnn )
[[:<:]] [[:>:]] alnum (_)
( ARE) () ([bc])\1 bb cc 'bc' RE ()
BRE ERE ^(.*)\1$ (a)*\1 a(a)(b)\1 aba(a)(b)\2 abb(a(b))\1
abab(a(b))\2 abb(a)\1 a{2,2}
()
METASYNTAX
RE (director) RE '***:' RE ARE RE '***=' RE
ARE embedded options : (?xyz) ( xyz ) RE :
b RE BRE
c ()
e RE ERE
i ( MATCHING )
m n
n ( MATCHING )
p ( MATCHING )
q RE ( ``quoted'')
s ()
t ()
w ( ``weird'') ( MATCHING )
x ()
) ARE
() RE RE -expanded ARE x # ( RE ) RE :
`\' `#'
`#'
ARE `(?:' `\('
blanktab |
ARE `(?#ttt)' ( ttt `)' ) `(?:'
( ***= ) RE
MATCHING
XBD RE
RE
: RE bb* abbbc 24 RE (wee|week)(knights|night) weeknights 10
(against) abcdef RE (.*).* , (1) abcdef bc RE (a*)* (1)
()acdacaaa (ac*)c*d[ac]*1 acdacaaa ( 1=a) (ac*) 1=ac (acdac)(): RE
RE RE RE (a.*b)(a.*b) accbaccccb
RE RE RE(preference):
RE RE () {m} {m}? ()( {m,n} m n) ( {m,n}? m n ) | RE
RE RE
{1,1} {1,1}? RE
bb* `abbbc' (week|wee)(night|knights) `weeknights'10(against) abc
(.*).* bc (a*)* RE
x `[xX]'[x] [xX] [^x] `[^xX]'
. ^ ( RE ) ^ $ ARE 0
. ^ '$'
^ $ .
LIMITS AND COMPATIBILITY
RE 256 RE POSIX RE
ARE POSIX ERE \ ARE POSIX ERE *** BRE ERE POSIX
ARE Perl Perl '\b''\B' RE /
beta RE ()
Henry Spencer 1986 regexp ( Tcl 8.1 ) ERE regexp ERE ( RRE) ARE : In
roughly increasing order of significance:
ARE \ RRE RRE
ARE { RRE {
ARE `[]' \ `[]' \ `\\' RRE [] `\\' \
ARE RE RRE( RRE (ARE ))
BASIC REGULAR EXPRESSIONS
BRE ERE `|', `+', ? \{ `\}', { } \( `\)', ( ) RE ^ RE $ RE * (
`^' ) \< \> [[:<:]] [[:>:]]
SEE ALSO
RegExp(3), regexp(n), regsub(n), lsearch(n), switch(n), text(n)
KEYWORDS
match, regular expression, string
[]
[]
2001/10/26
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