Regular Expression

 g -- global

i -- case sensetive

+ -- atleast one

? -- optional

*  --- zero or more 

.at   --- matches any word that ending or contains  at





g -- global

Examples 



i -- case sensitive






a+  ---  atleast matching one and proceeding token

example


matching words that contains atleast one  e


matching words that contains one e and proceeding token at



matching words that has e and a is optional



matching words that has 

e -- compulsory

e-- optional

t -- compulsory



matching words that has 

e -- compulsory

e-- optional

t -- optional



matching words that has 

e -- compulsory

a-- atleast one a

t -- optional




it matching that word has letter  e and r is optional




.at   --- matches any word that ending or contains  at


\w   -- matches all the word








\W  matches  except words




\s  matches white space



matching all words that contain more than 7 letters




matching words that has a  and contains any of the these letter [Slt]






matching words that has any word from a to z and ending with a


matching the word either T or t 


^  staring line
m  for multiline



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