9/25/2023 0 Comments Php trim full nameRegex to remove inline javascript from stringįirst things first, everyone is going to tell you that your approach is a bad idea. It's like trying to build an actual house out of toothpicks. It's just that HTML is a full dialect that needs an actual parser: regular expressions just aren't meant for this kind of thing. It's not that your algorithm isn't well thought out. It's up to you to decide if the failure rate is low enough.Įspecially important: If you are trying to use this as a security tool then definitely don't. Sure, your code might even work 90% of the time, but if you stick with regular expressions it will definitely fail on a regular basis. In contrast, the internet cumulatively has a bajillion hours experience writing hard-to-parse HTML strings. These, and the examples in my initial comment, are some exceptions I came up with just off the top of my head. In other words, I'm pretty sure that if you use your script to try to remove tags, you will also end up removing tags. I have actually seen this first one in use on the intertubes: it is technically valid HTML: Hi">Hover meĪnother good one: your new regular expression allows for more flexibility in the tag contents at the expense of tag specificity. Other than the easy ones I mentioned in my initial comment, here are some more variations that I think will completely sink your current code. You probably need a straight-up HTML parser. Your use case is a little simpler because you are just trying to remove the tags themselves (and not their contents), but even still it can be surprisingly tricky. However, if you are going to set this loose on arbitrary HTML from the internet, you will find that it fails to work in a number of cases. If you were using this on HTML code that you control yourself, it is certainly possible, because you can make sure that all of the edge cases never happen. Parsing arbitrary HTML via regular expressions is nearly impossible. $output = preg_replace($patterns, "", $str) Īlright! You made me do it. Chocolate is very Chocolate!Įcho htmlentities(removeTags($str, array("b", "div", "span"))) Opinions are my own.I recently wrote this function that, when supplied a string and an array of element types, will remove those element types from the string.Īs you could imagine this is a very very simple function, but I wanted to get opinions on speed, functionality, and any other comments anyone can come up with that can improve this function. Use those practices that best benefit your needs and goals. Your particular goals and needs may vary. The majority, if not all, of the examples provided, are performed on a personal development/learning workstation-environment and should not be considered production quality or ready. They are not the utmost best solution(s). Among those, he shares a love of tabletop RPG games, reading fantasy novels, and spending time with his wife and two daughters.ĭisclaimer: The examples presented in this post are hypothetical ideas of how to achieve similar types of results. Other favorite activities find him with his nose buried in a good book, article, or the Linux command line. Josh Otwell has a passion to study and grow as a SQL Developer and blogger. To receive email notifications (Never Spam) from this blog (“Digital Owl’s Prose”) for the latest blog posts as they are published, please subscribe (of your own volition) by clicking the ‘Click To Subscribe!’ button in the sidebar on the homepage! (Feel free at any time to review the Digital Owl’s Prose Privacy Policy Page for any questions you may have about: email updates, opt-in, opt-out, contact forms, etc…)īe sure and visit the “Best Of” page for a collection of my best blog posts. Since whitespace is difficult to see in browser output, I’ll use the strlen ( ) function and provide the length of an example string, that is prefixed with a single space character, before and after using trim ( ) on the string variable: If the optional 2nd parameter is not specified, trim ( ) removes these characters: Trim ( ) accepts 1 required parameter – the target string – and 1 optional parameter, the character(s) to remove. It’s a common practice to sanitize any user-input data from a web form, including the removal of any whitespace (blanks and spaces) from both the beginning and end of a string. Since coffee is my favorite drink, you can even buy me one if you would like!Ī space is a character and can be targeted with any of the 3 string functions I am covering in this post. If you enjoy the content written here, by all means, share this blog and your favorite post(s) with others who may benefit from or like it as well.
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