r'for\s*\(\s*(\w+(\.\w+)*)\s+(\w+)\s*=\s*0\s*;\s*(\w+(\.\w+)*)\s*<\s*(\w+(\.\w+)*)\.size\s*\(\s*\)\s*;\s*(\w+(\.\w+)*)\s*\+\+\s*\)' 如何修改这个正则表达式为能匹配for循环的任意自定义类型
时间: 2023-07-08 12:34:29 浏览: 258
要匹配任意自定义类型的for循环,需要将正则表达式中的`\w+(\.\w+)*`替换为更具一般性的类型匹配模式。假设自定义类型可以包含字母、数字、下划线和冒号(用于命名空间),可以使用`[a-zA-Z_:][a-zA-Z0-9_:]*`来匹配类型名。同时,为了考虑到模板类型,类型名需要支持尖括号内的参数。因此,修改后的正则表达式如下:
```
for\s*\(\s*([a-zA-Z_:][a-zA-Z0-9_:]*\s*(<.*>)?)\s+([a-zA-Z_][a-zA-Z0-9_]*)\s*=\s*0\s*;\s*([a-zA-Z_][a-zA-Z0-9_]*\s*(\.\s*[a-zA-Z_][a-zA-Z0-9_]*)*)\s*<\s*([a-zA-Z_][a-zA-Z0-9_]*\s*(\.\s*[a-zA-Z_][a-zA-Z0-9_]*)*)\.size\s*\(\s*\)\s*;\s*([a-zA-Z_][a-zA-Z0-9_]*\s*(\.\s*[a-zA-Z_][a-zA-Z0-9_]*)*)\s*\+\+\s*\)
```
这个正则表达式与原来的表达式唯一的区别就是将类型名的匹配模式更改为`[a-zA-Z_:][a-zA-Z0-9_:]*\s*(<.*>)?`,其中`\s*(<.*>)?`表示可选的尖括号内的参数。
相关问题
r'for\s*\(\s*(\w+)\s+(\w+)\s*=\s*0\s*;\s*(\w+)\s*<\s*(\w+)\.size\s*\(\s*\)\s*;\s*(\w+)\s*\+\+\s*\)' 如何修改能匹配类似a.b.size
如果要匹配类似`a.b.size`的字符串,可以将原来的`\w+`替换成`\w+(\.\w+)*`,表示匹配一个或多个由点号连接的字母、数字或下划线。修改后的正则表达式为:`r'for\s*\(\s*(\w+)\s+(\w+)\s*=\s*0\s*;\s*(\w+)\s*<\s*(\w+)\.size\s*\(\s*\)\s*;\s*(\w+)\s*\+\+\s*\)'`变成了`r'for\s*\(\s*(\w+(\.\w+)*)\s+(\w+)\s*=\s*0\s*;\s*(\w+(\.\w+)*)\s*<\s*(\w+(\.\w+)*)\.size\s*\(\s*\)\s*;\s*(\w+(\.\w+)*)\s*\+\+\s*\)'`,这样就可以匹配类似`a.b.size`的字符串了。
var b = document.body; var c = document.getElementsByTagName('canvas')[0]; var a = c.getContext('2d'); document.body.clientWidth; with(m=Math)C=cos,S=sin,P=pow,R=random;c.width=c.height=f=600;h=-250;function p(a,b,c){if(c>60)return[S(a*7)*(13+5/(.2+P(b*4,4)))-S(b)*50,b*f+50,625+C(a*7)*(13+5/(.2+P(b*4,4)))+b*400,a*1-b/2,a];A=a*2-1;B=b*2-1;if(A*A+B*B<1){if(c>37){n=(j=c&1)?6:4;o=.5/(a+.01)+C(b*125)*3-a*300;w=b*h;return[o*C(n)+w*S(n)+j*610-390,o*S(n)-w*C(n)+550-j*350,1180+C(B+A)*99-j*300,.4-a*.1+P(1-B*B,-h*6)*.15-a*b*.4+C(a+b)/5+P(C((o*(a+1)+(B>0?w:-w))/25),30)*.1*(1-B*B),o/1e3+.7-o*w*3e-6]}if(c>32){c=c*1.16-.15;o=a*45-20;w=b*b*h;z=o*S(c)+w*C(c)+620;return[o*C(c)-w*S(c),28+C(B*.5)*99-b*b*b*60-z/2-h,z,(b*b*.3+P((1-(A*A)),7)*.15+.3)*b,b*.7]}o=A*(2-b)*(80-c*2);w=99-C(A)*120-C(b)*(-h-c*4.9)+C(P(1-b,7))*50+c*2;z=o*S(c)+w*C(c)+700;return[o*C(c)-w*S(c),B*99-C(P(b, 7))*50-c/3-z/1.35+450,z,(1-b/1.2)*.9+a*.1, P((1-b),20)/4+.05]}}setInterval('for(i=0;i<1e4;i++)if(s=p(R(),R(),i%46/.74)){z=s[2];x=~~(s[0]*f/z-h);y=~~(s[1]*f/z-h);if(!m[q=y*f+x]|m[q]>z)m[q]=z,a.fillStyle="rgb("+~(s[3]*h)+","+~(s[4]*h)+","+~(s[3]*s[3]*-80)+")",a.fillRect(x,y,1,1)}',0)转成html语言
将给定的代码转换为HTML语言需要进行一些调整。以下是转换后的代码:
```html
<!DOCTYPE html>
<html>
<head>
<style>
body {
margin: 0;
overflow: hidden;
}
canvas {
position: absolute;
top: 0;
left: 0;
}
</style>
</head>
<body>
<canvas></canvas>
<script>
var b = document.body;
var c = document.getElementsByTagName('canvas')[0];
var a = c.getContext('2d');
document.body.clientWidth;
with (m = Math) {
C = cos,
S = sin,
P = pow,
R = random;
c.width = c.height = f = 600;
h = -250;
function p(a, b, c) {
if (c > 60) return [S(a * 7) * (13 + 5 / (.2 + P(b * 4, 4))) - S(b) * 50, b * f + 50, 625 + C(a * 7) * (13 + 5 / (.2 + P(b * 4, 4)))) + b * 400, a * 1 - b / 2, a];
A = a * 2 - 1;
B = b * 2 - 1;
if (A * A + B * B < 1) {
if (c > 37) {
n = (j = c & 1) ? 6 : 4;
o = .5 / (a + .01) + C(b * 125) * 3 - a * 300;
w = b * h;
return [o * C(n) + w * S(n) + j * 610 - 390, o * S(n) - w * C(n) + 550 - j * 350, 1180 + C(B + A) * 99 - j * 300, .4 - a * .1 + P(1 - B * B, -h * 6) * .15 - a * b * .4 + C(a + b) / 5 + P(C(o * (a + 1) + (B > 0 ? w : -w)) / 25, 30) * .1 * (1 - B * B), o / 1e3 + .7 - o * w * 3e-6];
}
if (c > 32) {
c = c * 1.16 - .15;
o = a * 45 - 20;
w = b * b * h;
z = o * S(c) + w * C(c) + 620;
return [o * C(c) - w * S(c), 28 + C(B * .5) * 99 - b * b * b * 60 - z / 2 - h, z, (b * b * .3 + P(1 - (A * A), 7) * .15 + .3) * b, b * .7];
}
o = A * (2 - b) * (80 - c * 2);
w = 99 - C(A) * 120 - C(b) * (-h - c * 4.9) + C(P(1 - b, 7)) * 50 + c * 2;
z = o * S(c) + w * C(c) + 700;
return [o * C(c) - w * S(c), B * 99 - C(P(b, 7)) * 50 - c / 3 - z / 1.35 + 450, z, (1 - b / 1.2) * .9 + a * .1, P(1 - b, 20) / 4 + .05];
}
}
setInterval('for(i=0;i<1e4;i++)if(s=p(R(),R(),i%46/.74)){z=s[2];x=~~(s[0]*f/z-h);y=~~(s[1]*f/z-h);if(!m[q=y*f+x]|m[q]>z)m[q]=z,a.fillStyle="rgb("+~(s[3]*h)+","+~(s[4]*h)+","+~(s[3]*s[3]*-80)+")",a.fillRect(x,y,1,1)}', 0);
}
</script>
</body>
</html>
```
这样你就可以在HTML文件中使用这段代码,并在浏览器中观看效果。
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