Question

For each of the following pairs of regular expressions and strings, indicate the reason that the string does not match the regular expression Regular Expression String Reason for mismatch AbCdEfG AbCdefG [A-Z][a-zl*! CamelCase! Abc\.def Abcxdef 4 qwqwqwqX 6.I-11-90-9) [A-Z][A-Zlla-z] Xpp 8 Ovla-ZA-ZO-9]+ Ovalpha-bet3 [aeiou][a-z]*[A-Z]ayrunAway 10. [a-c-((de)l(fg))? m-defg

Answer 1

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1. The expression does not contain e, but in String 'e' is present.
2. String: CamelCase! but according to RE, we will not get any Upper-case letter, after the First letter(which is UPPER case), which is 'C' of 'Case'
3. RE: Abc\.def String: Abcxdef, there is no "x" possible from the Given RE.

4. String: qwqwqwqX
but according to RE, string can have multiple combination of 'qw' taken together, not seperately, so the 'q' before X is not possible.
5. there should be few characters before y.
6. there should be atleast do digits in the string, first digit (from 1 to 9) and seconddigit (from 0 to 9)
7. String: Xpp

the seconnd character should have been in Upper Case.

8- string: 0valpha-bet3
The string can not have '-'. because it is not present in RE

9- String: runAway

after any upper case leter, only 'ay'is possible.
but here after 'A' way is present.

10 - string: m-defg
The string can only start with any character between a and c, i.e, "a", "b", "c"

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