LOOKBEHIND objects represent look-behind assertions.
| regex | The REGEX base class. All other classes inherit |
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| len | The length of the string. Initform:0; Accessors:len; Type:fixnum. |
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| positivep | Whether this assertion is positive. Initargs::positivep; Reader:positivep. |
| regex | The inner regex. Initargs::regex; Accessors:regex. |
| compute-min-rest | Returns the minimal length of REGEX plus |
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| copy-regex | Implements a deep copy of a REGEX object. |
| create-matcher-aux | Creates a closure which takes one parameter, |
| remove-registers | Returns a deep copy of a REGEX (see COPY-REGEX) and |
| case-mode | Utility function used by the optimizer (see GATHER-STRINGS). |
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| compute-offsets | Returns the offset the following regex would have |
| end-string-aux | Returns the constant string (if it exists) REGEX |
| everythingp | Returns an EVERYTHING object if REGEX is equivalent to this object, otherwise NIL. So, “(.){1}” w... |
| flatten | Merges adjacent sequences and alternations, i.e. it |
| gather-strings | Collects adjacent strings or characters into one |
| regex-length | Return the length of REGEX if it is fixed, NIL otherwise. |
| regex-min-length | Returns the minimal length of REGEX. |
| start-anchored-p | Returns T if REGEX starts with a “real” start |