import re
strs = ['this_and', 'this.and', '(and)', '[and]', 'and^', ';And', 'land', 'andy']
phrase = "and"
rx = re.compile(r'(?<![^\W_]){}(?![^\W_])'.format(re.escape(phrase)), re.I)
for s in strs:
	print("{}: {}".format(s, bool(rx.search(s))))