fi # 正则表达式匹配 if [[ "$string" =~ ^hello[0-9]+$ ]]; then echo "The string matches the regex pattern." else echo "The string does not match the regex pattern." fi 4. 在字符串比较中使用引号来处理包含空格的字符串 当字符串中包含空格时,必须使用引号将字符串括起来,以避免空格导...
String replaceAll(String regex, String replacement) Replaces each substring of this string that matches the given regular expression with the given replacement. String replaceFirst(String regex, String replacement) Replaces the first substring of this string that matches the given regular expression with...
Returns the index within this string of the first occurrence of the specified substring. if (str.indexOf(sub) >= 0) { // do something } 使用String.matches方法判断是否包含子串,注意正则表达式元字符的转义 boolean matches(String regex) Tells whether or not this string matches the given regular ...
String.matches方法 booleanmatches(Stringregex) 通知此字符串是否匹配给定的正则表达式。 Stringstr="123456"; Stringre="\\d+"; if(str.matches(re)){ //dosomething } Pattern类和Matcher类 Stringstr="abcefgABC"; Stringre="a|f";//表示a或f Patternp=Patternpile(re); Matcherm=p.matcher(str); ...
如果字符串不是None或具有len > 0,则该字符串将是“truthy”。只需执行以下检查: if s: print("The string is valid!") js空判断错误 if(shang == null || shang == ""){ if(xia != null || xia != ""){这里不用判断 null,直接判断空串就行了。你把结果带入是空串var shang = ''//("#...
=. When it is used, the string to the right of the operator is considered an extended regular expression and matched accordingly (as in regex(3)). The return value is 0 if the string matches the pattern, and 1 otherwise. If the regular expression is syntactically incorrect, the ...
正则表达式语法同regex(7) man page所描述的一致。正则表达式匹配字符串时上述命令的退出状态为0,不匹配为1。正则表达式中用圆括号括起的子表达式可以访问shell变量BASH_REMATCH,如下: if [[ abcfoobarbletch =~ 'foo(bar)bl(.*)' ]] then echo The regex matches!
(3)). Thereturnvalueis0if the stringmatchesthepattern,and1otherwise. If the regular expressionissyntactically incorrect, the conditional expression’sreturnvalueis2.If the nocasematch shell option (see the descriptionofshoptinThe Shopt Builtin)isenabled, thematchisperformedwithoutregardtothecaseof...
连接操作符 (,) 选择操作符 \n 反向引用
" # 使用正则表达式匹配字符串,并将捕获组存储在变量中 if [[ $string =~ ^(Hello),\s(World)!$ ]]; then match1="${BASH_REMATCH[1]}" match2="${BASH_REMATCH[2]}" echo "捕获组1的结果:$match1" echo "捕获组2的结果:$match2" else echo "未匹配到字符串" fi...