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i want a pdf book about regioular expresstion. please help me...

hi.
I wanna a pdf book for regular expression learning (in php).
I'm persian so declare a easy learner.

i want check input and
1.if it was just numbers return 1 and if it has characters return 0.
2.if it was just characters return 1 and if it has numbers return 0.
3.if it was just characters and...

hi, i don't know how write regexp (preg_match() in php) and i wanna following regexps:
1. just number
2. just words
3. just words, numbers, -._
tanks.