Many thanks Chris, this really is useful.
I added \t \n \r \f to my copy of your list
Ron
On 3/25/13 6:59 AM, Christopher Stone wrote:
Hey Folks,
From time to time I need to double-check a reference when writing
regex, so I've made my own cheat-sheet.
I've got it in Typinator, so I can type an abbreviation and have it
instantly in whatever app I'm working in.
Perhaps someone else will find it of use.
I'm also interested in other people's cheat-sheets of all kinds -
Perl, Python, Ruby, Shell - whatever.
--
Best Regards,
Chris
————————————————————————————————————————————————————————————————————————————————————————————————————
BBEDIT REGULAR EXPRESSION GUIDE MODIFIED 2011-09-08 : 07:28
————————————————————————————————————————————————————————————————————————————————————————————————————
NOTES: PCRE (Perl Compatible Regular Expressions) is the engine BBEdit
uses. Items I'm unsure of are marked '# PCRE?'. The list while fairly
comprehensive is not complete.
————————————————————————————————————————————————————————————————————————————————————————————————————
PATTERN MODIFIERS
————————————————————————————————————————————————————————————————————————————————————————————————————
i case insensitive
m allow ^ and $ to match at \r
s allow . to match \r
x ignore most white space and allow inline comments in grep patterns
(?imsx) on
(?-imsx) off
(?i-msx) mixed
————————————————————————————————————————————————————————————————————————————————————————————————————
Regex Characters:
————————————————————————————————————————————————————————————————————————————————————————————————————
. any character except newline or carriage return
[ ] any single character of set
[^ ] any single character NOT of set
* 0 or more previous regular expression
*? 0 or more previous regular expression (non-greedy)
+ 1 or more previous regular expression
+? 1 or more previous regular expression (non-greedy)
? 0 or 1 previous regular expression
| alternation
( ) grouping regular expressions
^ beginning of a line or string
$ end of a line or string
{m,n} at least m but most n previous regular expression
{m,n}? at least m but most n previous regular expression (non-greedy)
\1-9 nth previous captured group
\& whole match # BBEdit: '&' only - no escape needed
\` pre-match # PCRE? NOT BBEdit
\' post-match # PCRE? NOT BBEdit
\+ highest group matched # PCRE? NOT BBEdit
\A beginning of a string
\b backspace(0x08)(inside[]only) # PCRE?
\b word boundary(outside[]only)
\B non-word boundary
\d digit, same as[0-9]
\D non-digit
\S non-whitespace character
\s whitespace character[ \t\n\r\f]
\W non-word character
\w word character[0-9A-Za-z_]
\z end of a string
\Z end of a string, or before newline at the end
(?#) comment
(?:) grouping without backreferences
(?=) zero-width positive look-ahead assertion
(?!) zero-width negative look-ahead assertion
(?>) nested anchored sub-regexp stops backtracking
(?imx-imx) turns on/off imx options for rest of regexp
(?imx-imx:…) turns on/off imx options, localized in group # '…'
indicates added regex pattern
————————————————————————————————————————————————————————————————————————————————————————————————————
PERL-STYLE PATTERN EXTENSIONS : BBEdit Documentation : '…' indicates
added regex pattern
————————————————————————————————————————————————————————————————————————————————————————————————————
Extension Meaning
————————————————————————————————————————————————————————————————————————————————————————————————————
(?:…) Cluster-only parentheses, no capturing
(?#…) Comment, discard all text between the parentheses
(?imsx-imsx) Enable/disable pattern modifiers
(?imsx-imsx:…) Cluster-only parens with modifiers
(?=…) Positive lookahead assertion
(?!…) Negative lookahead assertion
(?<=…) Positive lookbehind assertion
(?<!…) Negative lookbehind assertion
(?()…|…) Match with if-then-else
(?()…) Match with if-then
(?>…) Match non-backtracking subpattern (“once-only”)
(?R) Recursive pattern
————————————————————————————————————————————————————————————————————————————————————————————————————
POSITIONAL ASSERTIONS (duplicatation of above)
————————————————————————————————————————————————————————————————————————————————————————————————————
POSITIVE LOOKAHEAD ASSERTION:(?='pattern')
NEGATIVE LOOKAHEAD ASSERTION:(?!'pattern')
POSITIVE LOOKBEHIND ASSERTION:(?<='pattern') # Lookbehind Assertions
are of fixed-length
NEGATIVE LOOKBEHIND ASSERTION:(?<!'pattern')
————————————————————————————————————————————————————————————————————————————————————————————————————
SPECIAL CHARACTER CLASSES (POSIX standard except where 'Perl
Extension' is indicated):
————————————————————————————————————————————————————————————————————————————————————————————————————
CLASS MEANING
————————————————————————————————————————————————————————————————————————————————————————————————————
[[:alnum:]] alpha-numeric characters
[[:alpha:]] alphabetic characters
[[:ascii:]] character codes 0-127 # Perl Extension
[[:blank:]] horizontal whitespace
[[:cntrl:]] control characters
[[:digit:]] decimal digits (same as \d)
[[:graph:]] printing characters, excluding spaces
[[:lower:]] lower case letters
[[:print:]] printing characters, including spaces
[[:punct:]] punctuation characters
[[:space:]] white space (same as \s)
[[:upper:]] upper case letters
[[:word:]] word characters (same as \w) # Perl Extension
[[:xdigit:]] hexadecimal digits
[[:alpha:][:digit:]] usage example of multiple character classes
[[:^digit:]]+ NEGATED POSIX-style character class example
** POSIX-style character class names are case-sensitive
** The outermost brackets above indicate a RANGE; the class name
itself looks like this: [:alnum:]
————————————————————————————————————————————————————————————————————————————————————————————————————
CONDITIONAL SUBPATTERNS
————————————————————————————————————————————————————————————————————————————————————————————————————
Conditional subpatterns allow you to apply “if-then” or “if-then-else”
logic to pattern matching. The “if” portion can either be an integer
between 1 and 99, or an assertion.
The forms of syntax for an ordinary conditional subpattern are:
if-then: (?(condition)yes-pattern)
if-then-else: (?(condition)yes-pattern|no-pattern)
and for a named conditional subpattern are:
if-then: (?P<NAME>(condition)yes-pattern)
if-then-else: (?P<NAME>(condition)yes-pattern|no-pattern)
If the condition evaluates as true, the “yes-pattern” portion attempts
to match. Otherwise, the “no-pattern” portion does (if there is a
“no-pattern”).
————————————————————————————————————————————————————————————————————————————————————————————————————
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