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问为什么打印的数据比我预期的要多？
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Stack Overflow用户

提问于 2015-10-16 03:07:23

回答 1查看 53关注 0票数 0

这是我昨天遇到的另一个问题的下一部分，Awk doesn't match all match all my entries。我想用perl替换awk，我的第一个目标是在.c中提取函数声明并将其放入.h中。所以我想出了这个：

cat dict3.c | perl -ne '/([a-z_*]+[[:space:]]+[a-z_*]+[[:space:]]*\(.*?\))/i; print $1 . ";\n"'

但输出结果是：

    ;
;
;
;
;
;
;
;
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dictent_t* dictentcreate(const char * key, const char * val);
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
dict_t* dictcreate();
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdestroy(*dict_t d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
void dictdump(dict_t *d);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictlook(dict_t *d, const char * key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
int dictget(char* s, dict_t *d, const char *key);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t* dictadd(dict_t* d, const char * key, const char * val);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t dictup(dict_t d, const char * key, const char * newval);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);
dict_t* dictrm(dict_t* d, const char * key);

而文件中的每个函数只有一个声明。我不知道它是什么，因为每一行打印的重复次数不一样，所以它不可能只是一个循环……

regex

perl

awk

header-files

回答 1

Stack Overflow用户

发布于 2015-10-16 03:22:45

因为您没有在匹配正则表达式时使print命令有条件。试试这个：

perl -ne '/([\w*]+\s+[\w*]+\s*\(.*?\))/i and print $1 . ";\n"' dict3.c
# .......................................^^^

对于每一行，您都会打印上次成功匹配的匹配文本。

票数 4

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/33156526

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