import re

class RegularExpression:

    # sum fields of TrEx, MhEx (_total)
    STR_TOTAL_PATTERN = re.compile(r".*_total$")

    # sum fields  of pipe laying (pipe_150_mm)
    PIPE_MM_PATTERN = re.compile(r"^pipe_\d+_mm$")

    # sum fields of MH dc (d_0_to_0_75)
    D_RANGE_PATTERN = re.compile( r"^d_\d+(?:_\d+)?_to_\d+(?:_\d+)?$")