This question already has answers here:
What does this regex mean
(4 answers)
Closed 12 months ago.
After searching for 'working onload event' I found Abhishek's anwser which used /in/ and after that, I tried searching for it but couldn't find anything useful about it, does someone know what does it do?
Without more context, /in/ looks like a regular expression (as mentioned by VLAZ), which you can learn more about here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
I also like https://regex101.com/ for help reading or writing complex regular expressions. Just make sure to select the Javascript "flavor" as different languages implement regular expressions differently.
Related
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Regex match entire words only
(7 answers)
Closed 3 years ago.
Im using validates_format_of method to check a input text
Javascript cant read this regex. How or where I can change this regex to be as original:
(?<=^|,|\b)[1-7](?=$|,|\b)
Thanks
UPDATE:
the input text must be one o more digits separated by comma, ex: 1|1,2|1,2,3
As #wiktor said you should use
\b[1-7]\b
As \b only asserts positions, you don't need to worry about matching more than [1-7].
#Code Maniac correctly stated that look behind is not supported in Mozilla and many others, so about it. see
This question already has an answer here:
Learning Regular Expressions [closed]
(1 answer)
Closed 4 years ago.
I'm not good with RegEx and I would like have a RegEx for next URL scheme.
Can you help me to create a regular expression for that URL?
https://fonts/mapbox/{fontstack}/{range}.pbf
And if possible, show me one page to learn and understand it.
The best page I use to explain RegEx is https://regex101.com/.
In case your characters are all word characters, you can just use:
https://fonts/mapbox/(\w+)/(\w+).pbf
In the first group you will have "fontstack" and in the second you will have "range".
If you want to include a bit more of possible characters, maybe:
https://fonts/mapbox/([^\s\/])/([^\s\/]).pbf
You can see extensive explanations to both introducing them on the page I provided at the start.
This question already has answers here:
Negative lookbehind equivalent in JavaScript
(11 answers)
Negative lookahead Regular Expression
(7 answers)
Closed 8 years ago.
Something like the word 'pie' not preceded by the word 'pizza'. I'm fairly new to regexes, and this problem has been causing me trouble.
If you could provide an answer using JavaScript regex syntax, i'd be that much more thankful.
Edit: I could probably replicate the functionality by searching individually for the strings 'pizza pie' and 'pie' in two separate regexes, and only count the string indexes that appear in the second find but not the first. It's a convoluted solution that's not quite as fast, but can be easily multithreaded so I suppose it's okay.
This is called negative lookbehind, and a regex for "x not preceded by y" would look like (?<!y)x. Unfortunately, JavaScript doesn't support negative lookbehind, but check out this question for alternatives to it.
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
When to Use Double or Single Quotes in JavaScript
Difference between single quotes and double quotes in Javascript
I searched this website and google (in that exact order...) looking for:
Are there any differences between ' and " regarding to strings in Javascript\ JQuery?
Didn't find a thing...
As long as you pair them properly there is no difference.
No, there's no difference at all. It's a matter of personal preference.
Can be used interchangeably in terms of jquery selectors. Once one is chosen for enclosing selector string, then inner quotes will use the "other one", or perhaps be escaped.
This question already has answers here:
Closed 12 years ago.
Possible Duplicate:
Why split the <script> tag when writing it with document.write()?
I don't really do Javascript programming and was hard to google this but have seen something like this in a couple of different places (by good developers):
document.writeln('<scr'+'ipt src="'+pcheck+'" type="text/javascript"></scr'+'ipt>');
With the split always between the r and the i. What does this achieve?
This is to prevent any script blockers from loading this script, because they cannot find the "script" word within the text.