Regular Expression for a string

John Machin sjmachin at
Thu Nov 2 06:28:32 CET 2006

Teja wrote:
> HI all,
> I need to write a regular experssion for a string which satisfies the
> following a criteria :
> 1) it should start with an alphabet
> 2) it can contain alphabets/digits/_ from second character
> 3) it can contain "[a-z]" or "[0-9]" at the end. but this is optional

Based on the examples you give later, you don't mean "optional" (0 or 1
occurrences), you mean 0 or more occurrences.
Assuming "alphabet" means "English alphabetic":



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