regex-negation

I've got a regex issue, I'm trying to ignore just the number '41', I want 4, 1, 14 etc to all match. I've got this [^\b41\b] which is effectively what I want but this also ignores all single iterations of the values 1 and 4. As an example, this matches "41", but I want it to NOT match: \b41\b Try something like: \b(?!41\b)(\d+) The (?!...) construct is a negative lookahead so this means: find a word boundary that is not followed by "41" and capture a sequence of digits after it. You could use a negative look-ahead assertion to exclude 41 : /\b(?!41\b)\d+\b/ This regular expression is to be

I am stil struggling with understanding how Regex works exactly. I am getting usernames and they are in this format: firstname.lastname Both names may contain special international characters and they may contain an ' or - but I just need to detect if they contain any uppercase letters so I can throw an exception. I am using this expression [^A-Z].[^A-Z] It seems to me that this should work, I just don't understand why it doesn't. I hope somebody could explain. Thanks! [^A-Z] Simply means any character that isn't a capital A through capital Z. . Means any character you should be using \. As

I'm trying to parse a text file into sentences ending in periods, but names like Mr. Hopkins are throwing false alarms on matching for periods. What regex identifies "." but not "Mr." For bonus, I'm also using ! to find end of sentences, so my current Regex is /(!/./ and I'd love an answer that incorporates my !'s too. Use negative look behind . (?<!Mr|Mrs|Dr|Ms)\. This will match a period only if it does not come after Mr , Mrs , Dr or Ms <? $str = "This is Mr. Someone and Mrs. Somebody. They are here to meet Dr. SomeoneElse."; $str = preg_replace("/(?<!Mr|Mrs|Dr|Ms)\\./", "\n", $str); echo(

How can I match a specific sequence of digits as if it were a string in an XML Schema xs:pattern ? Say I have some tags containing arbitrary 10-character strings like <string>12345678990</string> And I want to rule out all tags with a specific blacklist of arbitrary sequences like 1234 , 2435 , ``9587`, or some such. How do I address the specific 4-digit sub-string in order to negate it and add it to a list of xs:pattern restrictions for <string> 's content model? I don't think there is any practical XSD-compliant regular expression that will match all strings except those containing "1234" as

I am trying to replace plain link to hyperlink in an html document. and my logic is private static final Pattern WEB_URL_PROTOCOL = Pattern.compile("(?i)http|https://"); StringBuffer sb = new StringBuffer(); if (text != null) { // Escape any inadvertent HTML in the text message text = EmailHtmlUtil.escapeCharacterToDisplay(text); // Find any embedded URL's and linkify Matcher m = Patterns.WEB_URL.matcher(text); while (m.find()) { int start = m.start(); if (start == 0 || text.charAt(start - 1) != '@') { String url = m.group(); Matcher proto = WEB_URL_PROTOCOL.matcher(url); String link; if

In a PHP variable I have some text that contains some keywords. These keywords are currently capitalised. I would like them to remain capitalised and be wrapped in curly brackets but once only. I am trying to write upgrade code but each time it runs it wraps the keywords in another set of curly brackets. What REGEX do I need to use to match the keyword alone without also matching it if it is {KEYWORD}. For example, the text variable is: $string = "BLOGNAME has posted COUNT new item(s), TABLE POSTTIME AUTHORNAME You received this e-mail because you asked to be notified when new updates are

I want to match any string that has a recurring cycle. Like in this data: 3333333333333333333333333333333333333333 / 1 digit cycle(3) 1666666666666666666666666666666666666666 / 1 digit cycle(6) 1428571428571428571428571428571428571428 / 6 digit cycle(142857) 1111111111111111111111111111111111111111 / 1 digit cycle(1) 0909090909090909090909090909090909090909 / 2 digit cycle(09) 0834522467546323545411673445234655345222 / no cycle 0769230769230769230769230769230769230769 / 6 digit cycle(769230) 0714285714285714285714285714285714285714 / 6 digit cycle(714285)

I am facing a problem to match and replace certain words, not contained in http:// Present Regex: http://.*?\s+ This matches the pattern http://www.egg1.com http://www.egg2.com I need a regex to match certain words contained outside the http:// Example: "This is a sample. http://www.egg1.com and http://egg2.com. This regex will only match this egg1 and egg2 and not the others contained inside http:// " Match: egg1 egg2 Replaced: replaced1 replaced2 Final Output : "This is a sample. http://www.egg1.com and http://egg2.com. This regex will only match this replaced1 and replaced2 and not the