Regex Replace PHP Operations by BCMath functions

bcmath_regex.text

YOU SHOULD NOT BLINDLY REPLACE USING THESE REGEX, FALSE POSITIVES ARE POSSIBLE.

These were written to make the job easier, but it still needs checking.

Adding var regex, replaces $var1 + $var2 by bcadd($Var1, $var2, 2)
Regex: (\$[\$\'\'\"\"\[\]\_A-z0-9]+?)[\s]*\+[\s]*([\$\'\'\"\"\[\]\_A-z0-9]+)
Replace: bcadd($1,$2)

Replaces $var1 += $var2 by $var1 = bcadd($var1,$var2)
Regex: (\$[\$\'\'\"\"\[\]\_A-z0-9]+?)[\s]*\+\=[\s]*(\$[\$\'\'\"\"\[\]\_A-z0-9]+)
Replace: $1 = bcadd($1,$2)

Same as the previous one, but includes function calls and needs to have a ; at the end, so it would replace for example:
$var1 += round($var2, 2); by $var1 = bcadd($var1,round($var2, 2);
Regex: ([^\s]+)[\s]*\+\=[\s]*([^\s]+);
Replace: $1 = bcadd($1,$2);

Subtracting var regex, replaces $var1 - $var2 by bcsub($var1, $var2)
Regex: (\$[\$\'\'\"\"\[\]\_A-z0-9]+?)[\s]*\-[\s]*([\$\'\'\"\"\[\]\_A-z0-9]+)
Replace: bcsub($1,$2);

Regex: (\$[\$\'\'\"\"\[\]\_A-z0-9]+?)[\s]*\-\=[\s]*(\$[\$\'\'\"\"\[\]\_A-z0-9]+)
Replace: $1 = bcsub($1,$2)

Same as the previous one, but includes function calls and needs to have a ; at the end, so it would replace for example:
$var1 -= round($var2, 2); by $var1 = bcadd($var1,round($var2, 2);
Regex: ([^\s]+)[\s]*\-\=[\s]*([^\s]+);
Replace: $1 = bcsub($1,$2);

Multiplying var regex, replaces $var1 * $var2 by bcmul($var1, $var2)
Regex: (\$[\$\'\'\"\"\[\]\_A-z0-9]+?)[\s]*\*[\s]*([\$\'\'\"\"\[\]\_A-z0-9]+)
Replace: bcmul($1,$2)

Dividing var regex, replaces $var1 / $var2 by bcdiv($var1, $var2)
Regex: (\$[\$\'\'\"\"\[\]\_A-z0-9]+?)[\s]*\\[\s]*([\$\'\'\"\"\[\]\_A-z0-9]+)
Replace: bcdiv($1,$2)