首页 \ 问答 \ 如何在模式搜索中替换字符串变量(How to substitute a string variable in a pattern search)

如何在模式搜索中替换字符串变量(How to substitute a string variable in a pattern search)

在TCL中,我试图通过使用正则表达式来进行模式检索。 它在使用直接模式搜索时正在工作,但如果我使用模式的变量则不会。

例如:

set str "this is actual string to search the pattern"
set pat "the"

regexp {the} $str val
regexp {$pat} $str val1

puts $val;  # it's working
puts $val1; # it's not working, showing error

如何在模式搜索中替换字符串变量,我甚至使用过[...]但它不起作用


In TCL, I'm trying to pattern search by using regular expression. It's working while using a direct pattern search, but not if I use a variable for the pattern.

For example:

set str "this is actual string to search the pattern"
set pat "the"

regexp {the} $str val
regexp {$pat} $str val1

puts $val;  # it's working
puts $val1; # it's not working, showing error

How to substitute a string variable in a pattern search, I have even used [...] but it's not working


原文:https://stackoverflow.com/questions/48162134
更新时间:2019-11-29 14:51

最满意答案

        ref_geometry = ref_feature.GetGeometryRef()
        pts = ref_geometry.GetGeometryRef(0)
        points = []
        for p in xrange(pts.GetPointCount()):
            points.append((pts.GetX(p), pts.GetY(p)))

def edges_index(points):
    """
    compute edges index for a given 2D point set

    1- The number of edges which form the polygon
    2- Perimeter
    3- The length of the longest edge in a polygon
    4- The length of the shortest edge in a polygon
    5- The average length of all of edges in a polygon
    6- The lengths of edges deviate from their mean value
    """
    Nedges = len(points)-1
    length = []
    for i in xrange(Nedges):
        ax, ay = points[i]
        bx, by = points[i+1]
        length.append(math.hypot(bx-ax, by-ay))
    edges_perimeter = numpy.sum(length)
    edges_max = numpy.amax(length)
    edges_min = numpy.amin(length)
    edges_average = numpy.average(length)
    edges_std = numpy.std(length)
    return (Nedges,edges_perimeter,edges_max,edges_min,edges_average,edges_std)

poly = [(0,10),(10,10),(10,0),(0,0)]


def segments(poly):
        """A sequence of (x,y) numeric coordinates pairs """
        return zip(poly, poly[1:] + [poly[0]])

def area(poly):
    """A sequence of (x,y) numeric coordinates pairs """
    return 0.5 * abs(sum(x0*y1 - x1*y0
        for ((x0, y0), (x1, y1)) in segments(poly)))

def perimeter(poly):
    """A sequence of (x,y) numeric coordinates pairs """
    return abs(sum(math.hypot(x0-x1,y0-y1) for ((x0, y0), (x1, y1)) in segments(poly)))

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