well.. there are various things... such as \b, to match word boundaries... \D to match non-digit characters... \s to match whitespace (spaces tabs newlines)... \b is zero width so will work at the front of a string... there is also the ability to do things such as [\A\s]0 which matches the beginning of a string or a space followed by a zero... (i think that will work the way I mean)

In this case though, \b is probably the way to go...

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