[英]Find first match following another string, python regex multiline
我知道已經問過許多這樣的問題,但是讓正則表達式聲明來解決我的特定問題有點麻煩。
我有很多名稱不同但功能完全相同的函數,我需要在特定函數名稱后找到第一個匹配項。
請注意,我正在使用python搜索C文件。
writecwp_positionStatus(int action,
u_char *var_val,
u_char var_val_type,
size_t var_val_len,
u_char *statP,
oid *name,
size_t name_len) {
static long intval;
static long old_intval;
switch ( action ) {
case RESERVE1:
if (var_val_type != ASN_INTEGER) {
fprintf(stderr, "write to mib not ASN_INTEGER\n");
return SNMP_ERR_WRONGTYPE;
}
if (var_val_len > sizeof(long)) {
fprintf(stderr,"write to mib: bad length\n");
return SNMP_ERR_WRONGLENGTH;
}
intval = *((long *) var_val);
break;
case RESERVE2:
break;
case FREE:
/* Release any resources that have been allocated */
break;
case ACTION:
/*
* The variable has been stored in 'value' for you to use,
* and you have just been asked to do something with it.
* Note that anything done here must be reversable in the UNDO case
*/
old_intval = starting_int;
starting_int = intval;
break;
case UNDO:
/* Back out any changes made in the ACTION case */
starting_int = old_intval;
break;
case COMMIT:
/*
* Things are working well, so it's now safe to make the change
* permanently. Make sure that anything done here can't fail!
*/
break;
} return SNMP_ERR_NOERROR;
}
在此示例中,我想找到第一個“ old_intval = starting_int;”。 在函數名稱“ writecwp_positionStatus”之后。 具有相同確切主體但名稱不同的更多功能。
我的想法是建立一個匹配的捕獲小組:
(function name)(everything in between including newlines)(line to replace)
我嘗試了很多不同的選擇,例如,但每次似乎只有一點點偏離:
(writecwp_positionStatus\(.*\s)((.*\s)*?)(\s*old_intval = starting_int;)
我建議改用此正則表達式。
(writecwp_positionStatus[\s\S]*?)old_intval = starting_int;([\s\S]*)
在這里,方法是捕獲從函數名到要由捕獲組01替換的語句的所有內容,然后在捕獲組02的表尾匹配所有內容。
\s -> whitespace character (a space, a tab, a line break, or a form feed).
\S -> non-white space character.
*? -> ? after quantifiers makes them lazy/non-greedy.
現在要替換該語句,我們可以使用另一個正則表達式:
\1 >>>I am the replacement<<< \2
這里,
\1 -> Everything before the statement.
\2 -> Everything after the statement.
為了更好地理解,請在此處進行實驗。 希望這就是您想要的。
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