Head Looking Down Reference

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Каким образом исправить ошибку "cannot lock ref 'HEAD': unable to..."

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Regex Tutorial - Lookahead and Lookbehind Zero-Length Assertions

Lookahead and lookbehind, collectively known as “lookaround”, are zero-length assertions similar to the beginning and finish of line, and start and finish of word anchors explained earlier in this instructional. The difference is that lookaround in truth suits characters, however then offers up the match, returning handiest the outcome: match or no fit. That is why they're called “assertions”. They don't devour characters within the string, but most effective assert whether or not a fit is imaginable or now not. Lookaround allows you to create common expressions that are impossible to create without them, or that would get very longwinded with out them.

Positive and Negative Lookahead

Negative lookahead is indispensable if you wish to fit one thing now not adopted via one thing else. When explaining persona categories, this educational explained why you can't use a negated character elegance to match a q no longer followed via a u. Negative lookahead supplies the answer: q(?!u). The unfavorable lookahead construct is the pair of parentheses, with the hole parenthesis adopted through a query mark and an exclamation point. Inside the lookahead, we've the trivial regex u.

Positive lookahead works simply the similar. q(?=u) fits a q that is adopted by a u, without making the u a part of the match. The certain lookahead construct is a pair of parentheses, with the outlet parenthesis followed by a question mark and an equals sign.

You can use any common expression within the lookahead (however now not lookbehind, as explained beneath). Any valid common expression can be used throughout the lookahead. If it contains taking pictures teams then the ones groups will seize as commonplace and backreferences to them will paintings usually, even outdoor the lookahead. (The only exception is Tcl, which treats all teams inside of lookahead as non-capturing.) The lookahead itself is not a taking pictures staff. It is not included in the count towards numbering the backreferences. If you wish to have to store the match of the regex inside of a lookahead, you must put capturing parentheses across the regex throughout the lookahead, like this: (?=(regex)). The other way around is not going to paintings, for the reason that lookahead will have already got discarded the regex fit by the point the shooting group is to store its match.

Regex Engine Internals

First, let’s see how the engine applies q(?!u) to the string Iraq. The first token within the regex is the literal q. As we already know, this causes the engine to traverse the string till the q within the string is matched. The position within the string is now the void after the string. The next token is the lookahead. The engine takes note that it is inside of a lookahead construct now, and starts matching the regex within the lookahead. So the next token is u. This does now not match the void after the string. The engine notes that the regex throughout the lookahead failed. Because the lookahead is detrimental, because of this the lookahead has effectively matched on the current place. At this point, all of the regex has matched, and q is returned as the match.

Let’s take a look at making use of the similar regex to hand over. q matches q. The subsequent token is the u inside the lookahead. The subsequent persona is the u. These match. The engine advances to the next persona: i. However, it's carried out with the regex throughout the lookahead. The engine notes good fortune, and discards the regex match. This causes the engine to step again in the string to u.

Because the lookahead is unfavourable, the a success match inside it reasons the lookahead to fail. Since there are not any other permutations of this regex, the engine has to begin once more at the start. Since q cannot fit any place else, the engine reviews failure.

Let’s take yet another look inside, to be sure you understand the implications of the lookahead. Let’s follow q(?=u)i to quit. The lookahead is now sure and is adopted through any other token. Again, q matches q and u suits u. Again, the match from the lookahead must be discarded, so the engine steps back from i within the string to u. The lookahead was a hit, so the engine continues with i. But i can't match u. So this match strive fails. All ultimate makes an attempt fail as neatly, as a result of there are not more q’s within the string.

The regex q(?=u)i can never fit the rest. It tries to match u and that i on the same position. If there's a u straight away after the q then the lookahead succeeds however then i fails to check u. If there is anything else instead of a u in an instant after the q then the lookahead fails.

Positive and Negative Lookbehind

Lookbehind has the similar effect, but works backwards. It tells the regex engine to quickly step backwards within the string, to check if the text within the lookbehind can be matched there. (?<!a)b fits a “b” that's not preceded via an “a”, the use of adverse lookbehind. It doesn’t fit cab, however matches the b (and best the b) in bed or debt. (?<=a)b (certain lookbehind) suits the b (and simplest the b) in cab, but does not fit mattress or debt.

The construct for certain lookbehind is (?<=textual content): a couple of parentheses, with the opening parenthesis followed by a query mark, “less than” image, and an equals sign. Negative lookbehind is written as (?<!text), the usage of an exclamation point as an alternative of an equals signal.

More Regex Engine Internals

Let’s follow (?<=a)b to thingamabob. The engine begins with the lookbehind and the primary persona within the string. In this example, the lookbehind tells the engine to step again one persona, and see if a can be matched there. The engine can not step back one character because there are no characters ahead of the t. So the lookbehind fails, and the engine starts once more on the subsequent persona, the h. (Note that a negative lookbehind would have succeeded right here.) Again, the engine quickly steps back one character to test if an “a” can also be found there. It finds a t, so the sure lookbehind fails again.

The lookbehind continues to fail till the regex reaches the m in the string. The engine once more steps back one character, and notices that the a will also be matched there. The positive lookbehind matches. Because it is zero-length, the current place in the string remains on the m. The next token is b, which can't match right here. The subsequent persona is the second one a within the string. The engine steps back, and reveals out that the m does now not fit a.

The subsequent persona is the first b within the string. The engine steps back and reveals out that a satisfies the lookbehind. b matches b, and all the regex has been matched effectively. It matches one persona: the first b within the string.

Important Notes About Lookbehind

The just right news is that you'll be able to use lookbehind any place within the regex, not only at the beginning. If you want to find a phrase now not finishing with an “s”, it is advisable to use \b\w+(?<!s)\b. This is surely no longer the similar as \b\w+[^s]\b. When implemented to John's, the former matches John and the latter matches John' (together with the apostrophe). I will be able to depart it up to you to figure out why. (Hint: \b matches between the apostrophe and the s). The latter also doesn’t fit single-letter words like “a” or “I”. The proper regex without using lookbehind is \b\w*[^s\W]\b (famous person as an alternative of plus, and \W in the character elegance). Personally, I in finding the lookbehind more uncomplicated to know. The ultimate regex, which fits appropriately, has a double negation (the \W within the negated persona magnificence). Double negations tend to be complicated to humans. Not to regex engines, despite the fact that. (Except in all probability for Tcl, which treats negated shorthands in negated personality categories as an error.)

The bad news is that most regex flavors do not help you use simply any regex inside a lookbehind, as a result of they cannot practice a regular expression backwards. The regular expression engine wishes to be able to work out what number of characters to step back ahead of checking the lookbehind. When comparing the lookbehind, the regex engine determines the size of the regex throughout the lookbehind, steps again that many characters in the matter string, after which applies the regex inside the lookbehind from left to right simply as it could with an ordinary regex.

Many regex flavors, including those utilized by Perl, Python, and Boost simplest allow fixed-length strings. You can use literal text, character escapes, Unicode escapes rather then \X, and character classes. You can not use quantifiers or backreferences. You can use alternation, however provided that all possible choices have the same length. These flavors assessment lookbehind through first stepping back through the topic string for as many characters because the lookbehind wishes, and then attempting the regex inside the lookbehind from left to proper.

Perl 5.30 supports variable-length lookbehind as an experimental function. But there are many instances by which it does not work correctly. So in follow, the above remains to be true for Perl 5.30.

PCRE isn't fully Perl-compatible in relation to lookbehind. While Perl requires possible choices inside lookbehind to have the same size, PCRE allows possible choices of variable length. PHP, Delphi, R, and Ruby also allow this. Each selection nonetheless has to be fixed-length. Each choice is treated as a separate fixed-length lookbehind.

Java takes things a step additional by means of allowing finite repetition. You can use the question mark and the curly braces with the max parameter specified. Java determines the minimum and most imaginable lengths of the lookbehind. The lookbehind in the regex (?<!ab2,4c3,5d)test has Five conceivable lengths. It will also be from 7 thru 11 characters long. When Java (model 6 or later) tries to compare the lookbehind, it first steps again the minimal selection of characters (7 on this instance) in the string after which evaluates the regex inside the lookbehind as same old, from left to right. If it fails, Java steps back one more persona and tries again. If the lookbehind continues to fail, Java continues to step back till the lookbehind either fits or it has stepped back the maximum collection of characters (11 in this example). This repeated stepping back during the topic string kills efficiency when the selection of possible lengths of the lookbehind grows. Keep this in mind. Don’t make a selection an arbitrarily large most selection of repetitions to work around the lack of infinite quantifiers inside lookbehind. Java Four and 5 have bugs that reason lookbehind with alternation or variable quantifiers to fail when it will have to achieve some situations. These insects have been fixed in Java 6.

Java Thirteen means that you can use the famous person and plus inside lookbehind, in addition to curly braces with out an higher restrict. But Java Thirteen still makes use of the arduous way of matching lookbehind introduced with Java 6. Java 13 also does now not accurately handle lookbehind with more than one quantifiers if considered one of them is unbounded. In some situations you can get an error. In other situations you can get unsuitable suits. So for each correctness and function, we advise you handiest use quantifiers with a low higher bound in lookbehind with Java 6 through 13.

The best regex engines that help you use a complete common expression within lookbehind, together with infinite repetition and backreferences, are the JGsoft engine and the .NET framework RegEx categories. These regex engines truly observe the regex inside the lookbehind backwards, going in the course of the regex within the lookbehind and in the course of the topic string from proper to left. They simplest want to overview the lookbehind once, regardless of what number of other imaginable lengths it has.

Finally, flavors like std::regex and Tcl don't strengthen lookbehind at all, despite the fact that they do toughen lookahead. JavaScript was like that for the longest time since its inception. But now lookbehind is part of the ECMAScript 2018 specification. As of this writing (late 2019), Google’s Chrome browser is the only fashionable JavaScript implementation that supports lookbehind. So if cross-browser compatibility issues, you'll be able to’t use lookbehind in JavaScript.

Lookaround Is Atomic

The fact that lookaround is zero-length routinely makes it atomic. As soon because the lookaround condition is happy, the regex engine forgets about the whole thing throughout the lookaround. It will not go into reverse throughout the lookaround to check out different diversifications.

The only scenario through which this makes any distinction is when you use taking pictures teams within the lookaround. Since the regex engine does no longer back down into the lookaround, it is going to not take a look at different variations of the taking pictures teams.

For this explanation why, the regex (?=(\d+))\w+1 by no means matches 123x12. First the lookaround captures 123 into 1. \w+ then matches the entire string and backtracks until it suits only one. Finally, \w+ fails since 1 can't be matched at any place. Now, the regex engine has not anything to go into reverse to, and the total regex fails. The backtracking steps created via \d+ had been discarded. It by no means gets to the point where the lookahead captures best 12.

Obviously, the regex engine does try additional positions in the string. If we alter the topic string, the regex (?=(\d+))\w+1 does match 56x56 in 456x56.

If you don’t use capturing teams within lookaround, then all this doesn’t matter. Either the lookaround situation can also be happy or it can't be. In how many ways it can be satisfied is beside the point.

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