REGEX 是要走的路.

REGEX is the way to go.

{{ *form *| *(S+) *}}

应该可以很好地解决问题.

should do the trick nicely.

稍微解释一下:

• { 和 } 将分别匹配 { 和 }.
• * 将匹配 0 到无限空格字符 ().
• (S+) 将匹配 1 到无限个非空格字符(a, B, 3, _ etc).

• { and } will each match { and } respectively.
• * will match for 0 to infinite space characters ().
• (S+) will match for 1 to infinite non-space characters (a, B, 3, _ etc).