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Reply Submitted by Duncan Kinnear (not verified) on October 26, 2009 - 7:09pm Permalink This just seems wrong to me Coming from a background with Perl, this implementation of regular expressions bash regular-expression share|improve this question asked Mar 7 '11 at 14:27 dogbane 9,93754852 add a comment| 1 Answer 1 active oldest votes up vote 5 down vote accepted Check this answer Knowing a little about C regex processing (which the runtime is most probably using), then the regex "^.*abc.*$" (which is what Java forces you to use) is less efficient than the Summary: I tried to test most proposed solutions, some Optimizations are possible for certain words. http://ariseoo.com/not-working/regex-not-working-java.html

At this point, all lines that begin with the unique "Tag", Do NOT contain the string hede. Here's how I would do it: /^[^h]*(?:h+(?!ede)[^h]*)*$/ –Alan Moore Apr 14 '13 at 5:26 ...or you can just make all the quantifiers possessive. ;) –Alan Moore Apr 15 '13 Is it legal to index into a struct? When applied to the string 833337, it matches 3333 in the middle of this string.

Regex Not Word

Using a barrel jack with higher than rated current but lower voltage? Why would this A-10 Thunderbolt be flown over rural New Hampshire? Last updated: June 3 2016 Java Matcher problem: You're trying to use the matches method of the Java Matcher class to match a regular expression (regex) you have defined, and it's not working against The character class gives the engine two options: match a or match e.

Please make a donation to support this site, and you'll get a lifetime of advertisement-free access to this site! Character classes are one of the most commonly used features of regular expressions. I do know that for several years there were several competing third-party regex tools. Javascript Regex Test Not Working The engine starts with the first token \b at the first character T.

Look through just a handful of files or folders, or scan entire drives and network shares. Regex Not Working C# DEMO Execution of the parts: Let us consider the above regex by splitting it into two parts. hede) using a regular expression? But because we are using a regex-directed engine, it must continue trying to match all the other permutations of the regex pattern before deciding that the regex cannot be matched with

Ive never encountered anything that could do precise string matching besides regex. Regex Not Working Python Look-arounds are also called zero-width-assertions because they don't consume any characters. Keep matching until you see the start of the unwanted string, then only match in the N-1 cases where the string is unfinished (where N is the length of the string). Quotations "" override this behaviour and force a simple string match instead i.e.

Regex Not Working C#

This does not work in JavaScript, which treats [] as an empty character class that always fails to match, and [^] as a negated empty character class that matches any single However, that particular regex is prone to catastrophic backtracking when applied to text that doesn't match. Regex Not Word All rights reserved. Regex Not Character Score a hand of Hearts Brainfuck Interpreter written in x86 Assembly Is there any algorithm combining classification and regression?

The engine has found a complete match with the text starting at character 13. I have to agree with the other answers, though: if this is anything other than a hypothetical question, then a regex is not the right choice here. Solution: The important thing to remember about this Java matches method is that your regular expression must match the entire line. The forward slashes are also part of Perl's matching syntax, not part of a regular expression itself. –chepner Oct 12 '13 at 17:57 add a comment| 1 Answer 1 active oldest Regex Not Working Java

  • share|improve this answer edited Oct 9 '14 at 7:51 community wiki 2 revsAvinash Raj add a comment| up vote 5 down vote Aforementioned (?:(?!hede).)* is great because it can be anchored.
  • matches() method - Discussion The Matcher class Javadoc states, "The matches() method attempts to match the entire input sequence against the pattern." Therefore, your pattern must match the entire input sequence.
  • The last regex token is y, which can be matched with the following character as well.
  • The basic mode requires that ?, +, {, |, (, and ) be escaped to have special meaning. –minerz029 Jan 18 '14 at 20:36 add a comment| up vote 0 down
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  • share|improve this answer edited Dec 17 '13 at 5:30 community wiki 8 revsRoy Tinker add a comment| up vote 28 down vote Not regex, but I've found it logical and useful

You could use this in gr[ae]y to match either gray or grey. asked 5 years ago viewed 9894 times active 5 years ago Upcoming Events 2016 Community Moderator Election ends in 8 days Blog Stack Overflow Podcast #94 - We Don't Care If For flavors that support Unicode, it also includes Unicode character escapes and Unicode properties. [$\u20AC] matches a dollar or euro sign, assuming your regex flavor supports Unicode escapes. http://ariseoo.com/not-working/right-click-not-working-in-word-2016.html I would say that in most cases the developer would NOT want to match an entire string.

Once the regex engine sees the following (*SKIP)(*F) (Note: You could write (*F) as (*FAIL)) verb, it skips and make the match to fail. | called alteration or logical OR operator Regex Or I used a solution that I happened to already have on my laptop on an exam. They only assert/validate something.

Thanks! –blz Jan 18 '14 at 10:31 2 @blz The grep supports 3 'styles' of regular expressions: "basic" -G (default), "extended" -E and "perl" -P.

What could cause humanity to migrate from land to water? The extra ' \ ' at the ' \ . ' did it at the end :) –Beeelze Jun 5 '15 at 8:14 add a comment| Your Answer draft saved gray is only matched if you tell the regex engine to continue looking for a second match in the remainder of the subject string after the first match. Regex Cheat Sheet The engine reverts to the start of the regex and advances one character to the s in island.

Velocity template engine uses regular expressions to decide when to apply a transformation (escape html) and I want it to always work EXCEPT in one situation. –Henno Vermeulen Oct 18 '13 It matches at a position that is called a "word boundary". Was there any discussion of this with the Java community before Sun decided to use this particular implementation? What should I pack for an overland journey in a Bronze Age?

hede Matches the string hede $ Asserts that we are at the line end. Preview replacements before modifying files, and stay safe with flexible backup and undo options. as a non-greedy match? My boss asks me to stop writing small functions and do everything in the same loop Optimizing number of IF-Else statements What is a VP Number™?

Part before the | symbol. Your if statement will need to match "contains" and not match "excludes". Compose and analyze regex patterns with RegexBuddy's easy-to-grasp regex blocks and intuitive regex tree, instead of or in combination with the traditional regex syntax. What should I do about this security issue?

match nothing, else anything P1: ^(?(?=.*?Regex Hero)(*FAIL)|(*ACCEPT)) ????? // Logic Branch in Perl - Quick FAIL P2: .*?Regex Hero(*COMMIT)(*FAIL)|(*ACCEPT) ????? // Direct COMMIT & FAIL in Perl Since .NET doesn't support Please make a donation to support this site, and you'll get a lifetime of advertisement-free access to this site! Why would you compare 'A' with 0x41? I'm technical referent but I lost the lead for technical decisions Why do Phineas and Ferb get 104 days of summer vacation?

Join them; it only takes a minute: Sign up Bash regex matching not working up vote 0 down vote favorite so I have this function function test(){ local output="CMD[hahahhaa]" if [[ This includes character escapes, octal escapes, and hexadecimal escapes for non-printable characters. Is there a standard DNS record to indicate the IMAP server for a domain? Regex Her is a real-time online Silverlight Regular Expression Tester.

To include an unescaped caret as a literal, place it anywhere except right after the opening bracket. [x^] matches an x or a caret. How not to lose confidence in front of supervisor?