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json . You can write your regex inside quotation marks after the "Regular expressions" : . Note that in JSON format, the \ is a special character called escape character. So you will have to write a double backslash \\ .
RegExp Object A regular expression is a pattern of characters. The pattern is used to do pattern-matching "search-and-replace" functions on text. In JavaScript, a RegExp Object is a pattern with Properties and Methods.
I am building a JSON validator from scratch, but I am quite stuck with the string part. My hope was building a regex which would match the following sequence found on JSON.org:
My regex so far is:
/^\"((?=\\)\\(\"|\/|\\|b|f|n|r|t|u[0-9a-f]{4}))*\"$/
It does match the criteria with a backslash following by a character and an empty string. But I'm not sure how to use the UNICODE part.
Is there a regex to match any UNICODE character expert " or \ or control character? And will it match a newline or horizontal tab?
The last question is because the regex match the string "\t", but not " " (four spaces, but the idea is to be a tab). Otherwise I will need to expand the regex with it, which is not a problem, but my guess is the horizontal tab is a UNICODE character.
Thanks to Jaeger Kor, I now have the following regex:
/^\"((?=\\)\\(\"|\/|\\|b|f|n|r|t|u[0-9a-f]{4})|[^\\"]*)*\"$/
It appears to be correct, but is there any way to check for control characters or is this unneeded as they appear on the non-printable characters on regular-expressions.info? The input to validate is always text from a textarea.
Update: the regex is as following in case anyone needs it:
/^("(((?=\\)\\(["\\\/bfnrt]|u[0-9a-fA-F]{4}))|[^"\\\0-\x1F\x7F]+)*")$/
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