Regular+Expressions

Regular Expressions regex

Tools Java regexr http://www.gskinner.com/RegExr/

Tips \1,\2, . . backslash and a number can be used to refer back to a group used previously in a regular expression $1, $2, .. dollar sign and a number can call back the groups when replacing text (?i). .case insensitive match in Java (?i) see (http://stackoverflow.com/questions/5568081/regex-replace-all-ignore-case)

see also How to find and replace regular expressions with groups in java How to match everything except a certain group with regular expressions

Instances of regular expressions I've used 5-6-13 regular expression to replace all lines that don't have a q1q at the end 3-14-13 regex to replace multiple spaces numbers and new lines with nothing 3-19-13 regex to replace multiple space characters with a tab 3-5-13d1351 regex to match y or fewer of something 3-5-13d1140 regex to reformat a hyphenated heirarchical list into Java like code so that it can be viewed in an IDE 3-5-13d1100 regex to match an exact number of something 2-26-13 regex to reformat fasta format into tab separated columns 2-15-13 how to match white space but not a new line 2-14-13 trouble matching new lines with regular expressions 2-10-13 find a sequence that may be gapped with other characters regex to reformat tab separated columns into fasta format 2-2-13 regex 1-19-13