regular expression syntax in php

Example	Description
‘/hello/’	It will match the word hello
‘/^hello/’	It will match hello at the start of a string. Possible matches are hello or helloworld, but not worldhello
‘/hello$/’	It will match hello at the end of a string.
‘/he.o/’	It will match any character between he and o. Possible matches are helo or heyo, but not hello
‘/he?llo/’	It will match either llo or hello
‘/hello+/’	It will match hello on or more time. E.g. hello or hellohello
‘/he*llo/’	Matches llo, hello or hehello, but not hellooo
‘/hello\|world/’	It will either match the word hello or world
‘/(A-Z)/’	Using it with the hyphen character, this pattern will match every uppercase character from A to Z. E.g. A, B, C…
‘/[abc]/’	It will match any single character a, b or c
‘/abc{1}/’	Matches precisely one c character after the characters ab. E.g. matches abc, but not abcc
‘/abc{1,}/’	Matches one or more c character after the characters ab. E.g. matches abc or abcc
‘/abc{2,4}/’	Matches between two and four c character after the characters ab. E.g. matches abcc, abccc or abcccc, but not abc