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alert('211'.replace(/^|\d/g,'a'));//结果为a2aa
$val = '211';
echo preg_replace('/^|\d/', 'a', $val);//结果为aaaa
import re
re.sub(r'^|\d','a','211');//结果a2aa
System.out.println("211".replaceAll("^|\\d", "a"));//结果a2aa
var replacement='a';
alert(replacement+'211'.replace(/\d/g,replacement));
$val = '211';
echo preg_replace('/\d/', 'a', 'a'.$val);