Regex limit number of characters. Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. The string can be a number or a set of numbers, or two groups of numbers separated with "-", but total count of all characters mustn't be more than 6. ). Your example suggests that you'd like to grab a number from inside the regex and then use this number to place a maximum length on another part that is matched later in the regex. I am trying to write a regular expression that will only allow lowercase letters and up to 10 characters. I had a working one that would just allow lowercase letters which was this: But I need to limit the number of characters to 10. Learn how to specify minimum and maximum lengths for strings using regular expressions with clear examples and best practices. The . {1,35}$, which should match any line of length 1-35. A regular expression to limit the length of characters (between x and y characters long). The following regular expression ensures that text is between 1 and 10 characters long, and additionally limits the text to the uppercase letters A–Z. I would like that regular expression to also enforce a minimum and maximum Mar 24, 2016 · 20 I am trying to implement a regular expression that will check a string is between 1 - 50 characters. . g. They are allowed to enter any characters. means any character except newline (which sometimes is but often isn't included, check your regex flavour). NET, Rust. You can rewrite your expression as ^. What I have so far looks like this: This does not work or compile. controlling the entry of mobile number to exactly 10 digits, controlling the entry of a valid email id etc. Example of valid strings 5 55-33 4444-1 1-4444 Mar 26, 2015 · Limit number of character of capturing group Asked 10 years, 4 months ago Modified 6 years, 9 months ago Viewed 17k times Jun 30, 2014 · Learn how to use regular expressions in your coding, and you will discover a wide range of uses. Here's how to use them to check string length. I've written a regular expression that matches any number of letters with any number of single spaces between the letters. Jul 21, 2014 · Like this: . Jul 29, 2025 · KoboToolbox supports regex to control the length and characters during data entry to a particular question (e. You can modify the regular expression to allow any minimum or maximum text length, or allow characters other than A–Z. I am new to creating regex expressions, but this is my attempt: ^{1,50}$ The reason I tried that is that I found this was the way to limit the characters. ngv ywfxis bvsub zve pnvigwfu dzaaxos lwz dlea aukik gzcpgem