java - Regular exppresion tuning -

i use following regular expression validating 1 of text areas:

^[a-za-z0-9][a-za-z0-9 ]+$ 

• it allows alpha numeric
• it avoids first space blank
• it allow blanks after first character

how should modify able allow following characters:

• coma (,)
• semicolon (;)
• colon (:)
• euro symbol (€)

^[a-za-z\d:;,\u20ac][a-za-z\d :;,\u20ac]+$ 

• \d digit
• \u20ac unicode value euro (€)