![]() ![]() Currently it's the first hit on google for the search phrase, regular expression space word. You can specify a range of characters by using a hyphen, but if the hyphen appears as the first or last character enclosed in the square brackets, it is taken as a literal hyphen to be included in the character class as a normal character. ![]() * I know this question is tagged vb.net, but based on 25,000 views, I'm guessing it's not only those folks who are coming across this question. Matches any one of the enclosed characters. Below is the explanation of the regular expression: Assert position at start of the string \w Match any word character a-zA-Z0-9 Quantifier: Between one and unlimited times, as many times as possible, giving back as. In older or more basic languages and utilities, like sed, \w and \s aren't defined, so write them out with character classes, e.g. This regular expression \w (\s\w ) will only allow a single space between words and no leading or trailing spaces. * In languages like Java you'll have to escape your backslashes, i.e. Here I suggest the by default because, for example, Windows linebreaks consist of two whitespace characters in sequence, \r\n, so you'll need the to catch both.Ĭheck what dialect of regular expressions you're using. If you want to allow tabs and newlines (whitespace characters), then replace the space with a \s : ^\w (\s \w )*$ If you want to allow multiple spaces between words (say, if you'd like to allow accidental double-spaces, or if you're working with copy-pasted text from a PDF), then add a after the space: ^\w ( \w )*$ The \sis used to express a single space, whitespace, tab, carriage return, new line vertical tab, and form feed characters in Regex. The space or whitespace can be also expressed in regex. Different characters are expressed with different regex signs. It is very useful to detect patterns in a bunch of text or strings. Some things to note about this (and answer: Regex or Regular Expression is used to match specific patterns in different strings. s matches whitespace like space, tab etc. It will match data as suggested in regex. Which, in my flavor (without using \w) translates to: ^ ( )*$ A Regular expression engine is infact a computer program, which might run as indenpendent standalone application on your PC or Mac or run inside a web browser from a server or as offline browser extension and processes regular expressions for you. Now that the question's gained some popularity however, I want to say.use answer. Originally I didn't think such details were worth going into, as OP was asking such a basic question that it seemed strictness wasn't a concern. A string that contains multiple spaces in between words, "Hello World".A string that leads and / or trails with spaces, " Hello World ".A string comprised entirely of spaces, " ".Due to the fact that * means zero or more, it would match all of the following cases that one would not usually mean to match: Just add a space in your character class. ![]()
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