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I need to define a regex for a string with the following requirements:
Name,Surname
I already tried something like ^[^1-9\?\*\.\?\$\^\_]{1,20}[,][^1-9\?\*\.\?\$\^\_\-]{1,20}$ but as you can find, it also matches a 40 chars long string.
How can I check for the whole string's maximum length and at the same time impose 1 comma inside of it and obviously not at the borders?
Thank you
272
The 0-9 indicates characters 0 through 9, the comma , indicates comma, and the semicolon indicates a ; . The closing ] indicates the end of the character set. The plus + indicates that one or more of the "previous item" must be present.
By combining the interval quantifier with the surrounding start- and end-of-string anchors, the regex will fail to match if the subject text's length falls outside the desired range.
In regex, there are basically two types of characters: Regular characters, or literal characters, which means that the character is what it looks like. The letter "a" is simply the letter "a". A comma "," is simply a comma and has no special meaning.
Basically (0+1)* mathes any sequence of ones and zeroes. So, in your example (0+1)*1(0+1)* should match any sequence that has 1. It would not match 000 , but it would match 010 , 1 , 111 etc. (0+1) means 0 OR 1.
Try the regex:
^(?=[^,]+,[^,]+$)[a-zA-Z,]{1,20}$
Rubular Link
Explanation:
^ : Start anchor
(?=[^,]+,[^,]+$) : Positive lookahead to ensure string has exactly one comma
surrounded by atleast one non-comma character on both sides.
[a-zA-Z,]{1,20} : Ensure entire string is of length max 20 and has only
letters and comma
$ : End anchor
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