php 5.1.6的正则表达式

Question

Can someone help me with a regular expression to include

A-z a-z 0-9 - _ (space) (dot) < > ( ) ~

and exclude other special symbols in ereg function of php 5.1.6?

I am getting too much confused with the escape character backslash and order of things i need to write if it is required. If not possible with ereg u can suggest me any similar function that works.

Thank you

Answer 1

Ereg version :

if (ereg('^[a-zA-Z0-9.<>()~ _-]+$', $subject)) {
    # Successful match
}

Preg version : (after popular demand)

if (preg_match('/^[a-zA-Z0-9.<>()~ _-]+$/', $subject)) {
    # Successful match
}

Something like this?

# ^[a-zA-Z0-9.<>()~ _-]+$
# 
# Assert position at the beginning of the string «^»
# Match a single character present in the list below «[a-zA-Z0-9.<>()~ _-]+»
#    Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
#    A character in the range between “a” and “z” «a-z»
#    A character in the range between “A” and “Z” «A-Z»
#    A character in the range between “0” and “9” «0-9»
#    One of the characters “.<>()~ ” «.<>()~ »
#    The character “_” «_»
#    The character “-” «-»
# Assert position at the end of the string (or before the line break at the end of the string, if any) «$»