Contents
Simple
* any string, 0 or more + one or more ? any single character . any one char ^ beginning of line $ end of line ^$ blank line [ ] set of characters [^] not in set of characters \ escape character \{\} # of occurances [0-9]\{5\} \{min,max\} () encloses groups of REs | or
Characters
Repetitions
Groups
* Back reference a group:
Special Characters
Positions
Alternatives
* One or Two
One|Two
Substitutions
RegEx Tools
* regexstorm.net/tester
* http://gskinner.com/RegExr/
* Expresso
References
* http://regexstorm.net/reference
* http://www.regular-expressions.info