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regular expressions 101

Extensive regex tester and debugger with highlighting for PHP, PCRE, Python and JavaScript.

Regular Expressions Programming Tools Productivity

regular expressions 101 Reviews and details

regular expressions 101 Landing Page
regular expressions 101 Landing Page

Social recommendations and mentions

We have tracked the following product recommendations or mentions on Reddit and HackerNews. They can help you see what people think about regular expressions 101 and what they use it for.
  • Recommendations for F1?
    Https:// will help you out. - Source: Reddit / about 6 hours ago
  • Apache mod_alias RedirectMatch everything except specific pattern
    I tested the following regular expression in all online testers I know (e.g. and all confirm that the regex should indeed match everything except the URLs I don't want it to match:. - Source: Reddit / 1 day ago
  • monitor email account for mails sent by backup solutions
    Testing for search and optionally replace - Source: Reddit / 4 days ago
  • ~/s/decimate/obliterate/g ~s/anyways/anyways/g
    When you go to instead of lol. Best of luck with your sed comment OP. - Source: Reddit / 4 days ago
  • How can I validate that a user is entering a valid email address during registration on my website?
    To play around with regex, - can output Python code for you as well. - Source: Reddit / 6 days ago
  • egg⌨️irl
    Oh thanks! I usually use regexr or regex101, the only reason I hate regex is, that I always forget everything and I have to relearn it every time I need it. - Source: Reddit / 12 days ago
  • [java] regex help
    Use to build and test your regex. - Source: Reddit / 12 days ago
  • Removing everything before first lower case character
    This will look for any number of capital letters, commas or spaces at the start of the line. It then adds the rest of the line into a group. If you enter this into, you'll get a better explanation. - Source: Reddit / 15 days ago
  • this regex doesn't work - why?
    Last tip: there are a number of online regexp tools, such as and Those are great resources to learn how regexps work. - Source: Reddit / 16 days ago
  • Java Regex. Why this simple code doesnt find matches? Im exuasted of looking solution.
    This is a really handy site for testing regex's by the way: - Source: Reddit / 17 days ago
  • I refuse to believe this way is the only way to capture every single digit… It’s horrible.
    I know about, but it's not helping me in this case. The struggle isn't a logical one, it's a syntactical one. Since I can't find in the documentation said syntax I would assume it does not exist. But I kinda refuse to believe this horrible redundancy can't be shortened without losing the single digit matching. No matter how I turn it either matches the whole thing as one long digit, or the last digit... - Source: Reddit / 24 days ago
  • Help with simple regex (I think)
    I've spent far too long trying to get this to work on . - Source: Reddit / 25 days ago
  • Remove text after character
    Try it at with the text this is a string (2023). - Source: Reddit / 27 days ago
  • Sentence selector in python
    Alternatively, you could read a general file of text, perhaps from an out of copyright book, and split it into sentences. You might want to look into using regex through the re module to help determine the sentence breaks in a file. Have a play with regex at - Source: Reddit / 30 days ago
  • Am i really expected to make regex expressions by hand on the spot?
    When customers are down, your network is hosed, and you need to quickly digest logs to get a handle on the problem, using isn't on the menu. - Source: Reddit / about 1 month ago
  • Regex only for numbers with commas
    I don’t have the solution for you, but there are some useful tools on the web, such as regex101. - Source: Reddit / about 1 month ago
  • Am i really expected to make regex expressions by hand on the spot?
    Https:// is a fantastic resource for writing and testing Regex. - Source: Reddit / about 1 month ago
  • Why can't you just be normal?
    Of course, you should always use a regex tester to verify the validity of the regex. - Source: Reddit / about 1 month ago
  • Advice on what formulas to use to clean data & rearrange information.
    I added some examples in red on the sheet, and you can see this dynamically if you put the names and regex into - Source: Reddit / about 1 month ago
  • Do you guys use Chat GPT to code? If so, what do you make?
    I use it makes Regex almost like a game. - Source: Reddit / about 1 month ago
  • Can someone please explain this to me?
    Go to Regex101 and type in your regular expression (which is what the text between the double quotes is). It will explain the entire regular expression to you. - Source: Reddit / about 1 month ago

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