We looked at how it works (it needs escaping to work), its two forms, and how it works in RegEx engines and JavaScript. This article showed you what the “S” character means and does in RegEx. Let str1 = 'Allofthesearenonsspacecharacters' Here’s an example in JavaScript: let regex1 = /\S/g Regular Expression (Regex) is another powerful weapon to search strings, and Java has good support for Regex. The \s and \S metacharacters work fine in any language that supports RegEx. You can match all space characters with an escaped lowercase letter “s”: You can match all non-space characters with an escaped capital letter “S”: When it’s in the small letter, it matches all space characters, such as the spacebar, tab, and carriage return.Īnd when it’s in the capital letter, it matches all non-space characters such as numbers, symbols, and letters.Įach of the space characters also has their respective metacharacters:Įxamples of How to Use The “S” Metacharacter NET regular expressions, and probably a lot of other languages as well. In the example below, I was able to match the space characters because I escaped the s:įor the example below, I was able to match the numbers because I escaped the d:Īs I mentioned earlier, the “S” metacharacter has two forms – the small letter “s” and the capital letter “S”. Regex Regular Expression for alphanumeric and underscores. So, to make metacharacters work in RegEx, you need to escape them with a backslash ( \). The reason is that if you only type the “S”, “s”, or “D” metacharacter into a RegEx engine or while writing RegEx in a programming language, it gets interpreted as that letter. For some languages where space in the regex isn't ignored you can just put the space in directly: a-zA-Z0-9 will also work. To make metacharacters work, you need to escape them. 5 Answers Sorted by: 1 It depends on the specific regex class you're using as to what the magic sequences are, but usually either \s, or :space: will work. In this article, we'll look at those two variations of the “S” character in RegEx, what they do, and their usage in both RegEx engines and programming. You can further see these Java Programming courses to learn. That's how the pattern for most metacharacters works.įor instance, the small letter “d” is the metacharacter for a digit, and the capital letter “D” is the non-digit. Regular expression to find white space is s, which finds all-white spaces including tab character. The small letter “s” metacharacter stands for space, and the capital letter “S” stands for non-space. In regular expressions, “S” is a metacharacter that represents space.
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