Regular Expression


TechEarth

Following are the important notations of regular expression:

[ ] matches only one character position with provided in between 
- it is used to match limit range of char or number provided in [ ] e.g [0-9]
^ it is used to negate the expression if it is inside of [ ] e.g [^fF]
^ outside [ ] means to match only at the begenning of target string
$ user to match at the end of target string
. used to match any char in this position
 escape character
? matches preceding char occurance 0 or 1 times only
* matches preceding char occurance 0 or more times only
+ matches preceding char occurance 1 or more times
{ } matches preceding char occurance n times exactly e.g [char]{n}
{n,m}

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