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Regular expression literals may include an optional modifier to control various aspects of matching. The modifiers are specified as an optional flag. You can provide multiple modifiers using exclusive OR (|), as shown previously and may be represented by one of these ?
| Modifier | Description |
|---|---|
| re.I | Performs case-insensitive matching. |
| re.L | Interprets words according to the current locale. This interpretation affects the alphabetic group (\w and \W), as well as word boundary behavior (\b and \B). |
| re.M | Makes $ match the end of a line (not just the end of the string) and makes ^ match the start of any line (not just the start of the string). |
| re.S | Makes a period (dot) match any character, including a newline. |
| re.U | Interprets letters according to the Unicode character set. This flag affects the behavior of \w, \W, \b, \B. |
| re.X | Permits "cuter" regular expression syntax. It ignores whitespace (except inside a set [] or when escaped by a backslash) and treats unescaped # as a comment marker. |
string2="ABCabc"m=re.search("[a-z]+",string2)m1=re.search("[a-z]+",string2,re.I)print(m.group())print(m1.group())#结果：abcABCabc
string3="yaobin \njack \nrain \nhy"m=re.search("^y.+$",string3)m1=re.search("^y.+$",string3,flags=re.M)if m:print("m: %s"%(m.group()))if m1:print("m1: %s"%(m1.group()))#结果m1: yaobin
string="abc \ndsf"m=re.match("(^a.*$)",string)m1=re.match("(^a.*$)",string,re.S)if m:print("m: %s"%(m.group()))if m1:print("m1: %s"%(m1.group()))#结果：m1: abcdsf
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原文地址：http://www.cnblogs.com/binhy0428/p/5221228.html
