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I'm new to actionscript and i cant seem to get the regex syntax right in actionscript3. The task is straight forward, i want to make sure that the first two characters in a given string are alphabets and nothing else. Here's what I'm doing and obviously it doesn't work or i wouldn't be here! ;-).
what am I doing wrong here?
var fileName:String = "- Earth";
var pattern:RegExp = /(A-Z)(a-z){0,1}/;
if (pattern.test(fileName)) {
Alert.show("Trew");
}
else {
Alert.show("phalse");
}
339
[] denotes a character class. () denotes a capturing group. [a-z0-9] -- One character that is in the range of a-z OR 0-9.
Basically (0+1)* mathes any sequence of ones and zeroes. So, in your example (0+1)*1(0+1)* should match any sequence that has 1. It would not match 000 , but it would match 010 , 1 , 111 etc. (0+1) means 0 OR 1.
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "." ; regex \+ matches "+" ; and regex \( matches "(" . You also need to use regex \\ to match "\" (back-slash).
[A-Za-z] will match all the alphabets (both lowercase and uppercase).
Not familiar with actionscript, but if it follows normal regex type rules, you need a regex more like:
/^[A-Za-z]{2}/
to match two alpha characters at the start of a string.
136
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